100381764557 has 4 divisors (see below), whose sum is σ = 101375643516. Its totient is φ = 99387885600.

The previous prime is 100381764541. The next prime is 100381764583. The reversal of 100381764557 is 755467183001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755467183001 = 37 ⋅20418031973.

It can be written as a sum of positive squares in 2 ways, for example, as 99161380201 + 1220384356 = 314899^2 + 34934^2 .

It is a cyclic number.

It is not a de Polignac number, because 100381764557 - 2⁴ = 100381764541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102381764557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496939328 + ... + 496939529.

It is an arithmetic number, because the mean of its divisors is an integer number (25343910879).

Almost surely, 2^100381764557 is an apocalyptic number.

It is an amenable number.

100381764557 is a deficient number, since it is larger than the sum of its proper divisors (993878959).

100381764557 is an equidigital number, since it uses as much as digits as its factorization.

100381764557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993878958.

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 100381764557 in words is "one hundred billion, three hundred eighty-one million, seven hundred sixty-four thousand, five hundred fifty-seven".