16639437925 has 12 divisors (see below), whose sum is σ = 22508621856. Its totient is φ = 12101409200.

The previous prime is 16639437907. The next prime is 16639437949. The reversal of 16639437925 is 52973493661.

It is not a de Polignac number, because 16639437925 - 2⁷ = 16639437797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30253249 + ... + 30253798.

It is an arithmetic number, because the mean of its divisors is an integer number (1875718488).

Almost surely, 2^16639437925 is an apocalyptic number.

It is an amenable number.

16639437925 is a deficient number, since it is larger than the sum of its proper divisors (5869183931).

16639437925 is a wasteful number, since it uses less digits than its factorization.

16639437925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60507068 (or 60507063 counting only the distinct ones).

The product of its digits is 7348320, while the sum is 55.

The spelling of 16639437925 in words is "sixteen billion, six hundred thirty-nine million, four hundred thirty-seven thousand, nine hundred twenty-five".