15645642884 has 6 divisors (see below), whose sum is σ = 27379875054. Its totient is φ = 7822821440.

The previous prime is 15645642847. The next prime is 15645642917. The reversal of 15645642884 is 48824654651.

It can be written as a sum of positive squares in only one way, i.e., 14285508484 + 1360134400 = 119522^2 + 36880^2 .

It is a super-2 number, since 2×15645642884² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1955705357 + ... + 1955705364.

It is an arithmetic number, because the mean of its divisors is an integer number (4563312509).

Almost surely, 2^15645642884 is an apocalyptic number.

It is an amenable number.

15645642884 is a deficient number, since it is larger than the sum of its proper divisors (11734232170).

15645642884 is a wasteful number, since it uses less digits than its factorization.

15645642884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911410725 (or 3911410723 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 53.

The spelling of 15645642884 in words is "fifteen billion, six hundred forty-five million, six hundred forty-two thousand, eight hundred eighty-four".