16665252638 has 16 divisors (see below), whose sum is σ = 25379606544. Its totient is φ = 8205468480.

The previous prime is 16665252619. The next prime is 16665252649. The reversal of 16665252638 is 83625256661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406706 + ... + 445802.

It is an arithmetic number, because the mean of its divisors is an integer number (1586225409).

Almost surely, 2^16665252638 is an apocalyptic number.

16665252638 is a deficient number, since it is larger than the sum of its proper divisors (8714353906).

16665252638 is a wasteful number, since it uses less digits than its factorization.

16665252638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42347.

The product of its digits is 3110400, while the sum is 50.

The spelling of 16665252638 in words is "sixteen billion, six hundred sixty-five million, two hundred fifty-two thousand, six hundred thirty-eight".