101750978434561 has 3 divisors (see below), whose sum is σ = 101750988521731. Its totient is φ = 101750968347392.

The previous prime is 101750978434559. The next prime is 101750978434577. The reversal of 101750978434561 is 165434879057101.

The square root of 101750978434561 is 10087169.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 57974229474561 + 43776748960000 = 7614081^2 + 6616400^2 .

It is not a de Polignac number, because 101750978434561 - 2¹ = 101750978434559 is a prime.

It is a super-2 number, since 2×101750978434561² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101750978434561.

It is not an unprimeable number, because it can be changed into a prime (101750978434541) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5043585 + ... + 15130753.

Almost surely, 2^{101750978434561} is an apocalyptic number.

101750978434561 is the 10087169-th square number.

101750978434561 is the 5043585-th centered octagonal number.

It is an amenable number.

101750978434561 is a deficient number, since it is larger than the sum of its proper divisors (10087170).

101750978434561 is an frugal number, since it uses more digits than its factorization.

101750978434561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20174338 (or 10087169 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 61.

The spelling of 101750978434561 in words is "one hundred one trillion, seven hundred fifty billion, nine hundred seventy-eight million, four hundred thirty-four thousand, five hundred sixty-one".