100754821561 has 3 divisors (see below), whose sum is σ = 100755138981. Its totient is φ = 100754504142.

The previous prime is 100754821537. The next prime is 100754821567. The reversal of 100754821561 is 165128457001.

The square root of 100754821561 is 317419.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165128457001 = 997 ⋅165625333.

It is not a de Polignac number, because 100754821561 - 2³³ = 92164886969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100754821567) 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, 158710 + ... + 476128.

It is an arithmetic number, because the mean of its divisors is an integer number (33585046327).

Almost surely, 2^100754821561 is an apocalyptic number.

100754821561 is the 317419-th square number.

100754821561 is the 158710-th centered octagonal number.

It is an amenable number.

100754821561 is a deficient number, since it is larger than the sum of its proper divisors (317420).

100754821561 is an frugal number, since it uses more digits than its factorization.

100754821561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634838 (or 317419 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 100754821561 in words is "one hundred billion, seven hundred fifty-four million, eight hundred twenty-one thousand, five hundred sixty-one".