1639138903915 has 16 divisors (see below), whose sum is σ = 1969575300000. Its totient is φ = 1309572986112.

The previous prime is 1639138903877. The next prime is 1639138903967. The reversal of 1639138903915 is 5193098319361.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1639138903915 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1639138903915.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 14361664 + ... + 14475346.

It is an arithmetic number, because the mean of its divisors is an integer number (123098456250).

Almost surely, 2^{1639138903915} is an apocalyptic number.

1639138903915 is a deficient number, since it is larger than the sum of its proper divisors (330436396085).

1639138903915 is a wasteful number, since it uses less digits than its factorization.

1639138903915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117486.

The product of its (nonzero) digits is 4723920, while the sum is 58.

The spelling of 1639138903915 in words is "one trillion, six hundred thirty-nine billion, one hundred thirty-eight million, nine hundred three thousand, nine hundred fifteen".