12987128818504 has 8 divisors (see below), whose sum is σ = 24350866534710. Its totient is φ = 6493564409248.

The previous prime is 12987128818501. The next prime is 12987128818507. The reversal of 12987128818504 is 40581882178921.

It is an interprime number because it is at equal distance from previous prime (12987128818501) and next prime (12987128818507).

It can be written as a sum of positive squares in only one way, i.e., 6856008086404 + 6131120732100 = 2618398^2 + 2476110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (12987128818501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811695551149 + ... + 811695551164.

Almost surely, 2^{12987128818504} is an apocalyptic number.

It is an amenable number.

12987128818504 is a deficient number, since it is larger than the sum of its proper divisors (11363737716206).

12987128818504 is a wasteful number, since it uses less digits than its factorization.

12987128818504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623391102319 (or 1623391102315 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 64.

The spelling of 12987128818504 in words is "twelve trillion, nine hundred eighty-seven billion, one hundred twenty-eight million, eight hundred eighteen thousand, five hundred four".