16521100061 has 4 divisors (see below), whose sum is σ = 16767683712. Its totient is φ = 16274516412.

The previous prime is 16521100033. The next prime is 16521100111. The reversal of 16521100061 is 16000112561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16521100061 - 2³⁰ = 15447358237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16521108061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123291725 + ... + 123291858.

It is an arithmetic number, because the mean of its divisors is an integer number (4191920928).

Almost surely, 2^16521100061 is an apocalyptic number.

It is an amenable number.

16521100061 is a deficient number, since it is larger than the sum of its proper divisors (246583651).

16521100061 is an equidigital number, since it uses as much as digits as its factorization.

16521100061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246583650.

The product of its (nonzero) digits is 360, while the sum is 23.

The spelling of 16521100061 in words is "sixteen billion, five hundred twenty-one million, one hundred thousand, sixty-one".