647921430138 has 16 divisors (see below), whose sum is σ = 1364045116320. Its totient is φ = 204606767376.

The previous prime is 647921430133. The next prime is 647921430173. The reversal of 647921430138 is 831034129746.

It is not an unprimeable number, because it can be changed into a prime (647921430133) 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, 2841760545 + ... + 2841760772.

It is an arithmetic number, because the mean of its divisors is an integer number (85252819770).

Almost surely, 2^647921430138 is an apocalyptic number.

647921430138 is an abundant number, since it is smaller than the sum of its proper divisors (716123686182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647921430138 is a wasteful number, since it uses less digits than its factorization.

647921430138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683521341.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 647921430138 in words is "six hundred forty-seven billion, nine hundred twenty-one million, four hundred thirty thousand, one hundred thirty-eight".