100521660605 has 4 divisors (see below), whose sum is σ = 120625992732. Its totient is φ = 80417328480.

The previous prime is 100521660587. The next prime is 100521660649. The reversal of 100521660605 is 506066125001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506066125001 = 409 ⋅1237325489.

It can be written as a sum of positive squares in 2 ways, for example, as 80155801924 + 20365858681 = 283118^2 + 142709^2 .

It is not a de Polignac number, because 100521660605 - 2²⁴ = 100504883389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10052166056 + ... + 10052166065.

It is an arithmetic number, because the mean of its divisors is an integer number (30156498183).

Almost surely, 2^100521660605 is an apocalyptic number.

It is an amenable number.

100521660605 is a deficient number, since it is larger than the sum of its proper divisors (20104332127).

100521660605 is an equidigital number, since it uses as much as digits as its factorization.

100521660605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20104332126.

The product of its (nonzero) digits is 10800, while the sum is 32.

Adding to 100521660605 its reverse (506066125001), we get a palindrome (606587785606).

The spelling of 100521660605 in words is "one hundred billion, five hundred twenty-one million, six hundred sixty thousand, six hundred five".