12915509384477 has 24 divisors (see below), whose sum is σ = 15232699699200. Its totient is φ = 10917116866656.

The previous prime is 12915509384389. The next prime is 12915509384489. The reversal of 12915509384477 is 77448390551921.

It is not a de Polignac number, because 12915509384477 - 2¹⁸ = 12915509122333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12915509384077) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1196708 + ... + 5221410.

It is an arithmetic number, because the mean of its divisors is an integer number (634695820800).

Almost surely, 2^{12915509384477} is an apocalyptic number.

It is an amenable number.

12915509384477 is a deficient number, since it is larger than the sum of its proper divisors (2317190314723).

12915509384477 is an equidigital number, since it uses as much as digits as its factorization.

12915509384477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025625 (or 4025618 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 65.

The spelling of 12915509384477 in words is "twelve trillion, nine hundred fifteen billion, five hundred nine million, three hundred eighty-four thousand, four hundred seventy-seven".