16400073638 has 16 divisors (see below), whose sum is σ = 28050805440. Its totient is φ = 7124013696.

The previous prime is 16400073631. The next prime is 16400073643. The reversal of 16400073638 is 83637000461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400073631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18551678 + ... + 18552561.

It is an arithmetic number, because the mean of its divisors is an integer number (1753175340).

Almost surely, 2^16400073638 is an apocalyptic number.

16400073638 is a deficient number, since it is larger than the sum of its proper divisors (11650731802).

16400073638 is a wasteful number, since it uses less digits than its factorization.

16400073638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37104271.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 16400073638 in words is "sixteen billion, four hundred million, seventy-three thousand, six hundred thirty-eight".