16521401044 has 48 divisors (see below), whose sum is σ = 29869959168. Its totient is φ = 7992286848.

The previous prime is 16521401033. The next prime is 16521401053. The reversal of 16521401044 is 44010412561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4656079 + ... + 4659625.

It is an arithmetic number, because the mean of its divisors is an integer number (622290816).

Almost surely, 2^16521401044 is an apocalyptic number.

It is an amenable number.

16521401044 is a deficient number, since it is larger than the sum of its proper divisors (13348558124).

16521401044 is a wasteful number, since it uses less digits than its factorization.

16521401044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904 (or 3902 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 16521401044 in words is "sixteen billion, five hundred twenty-one million, four hundred one thousand, forty-four".