15121474385956 has 9 divisors (see below), whose sum is σ = 26462593785649. Its totient is φ = 7560733304344.

The previous prime is 15121474385939. The next prime is 15121474385957. The reversal of 15121474385956 is 65958347412151.

The square root of 15121474385956 is 3888634.

It is a perfect power (a square), and thus also a powerful number.

15121474385956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7434074902500 + 7687399483456 = 2726550^2 + 2772616^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15121474385894 and 15121474385903.

It is not an unprimeable number, because it can be changed into a prime (15121474385957) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6805110 + ... + 8749426.

Almost surely, 2^{15121474385956} is an apocalyptic number.

15121474385956 is the 3888634-th square number.

It is an amenable number.

15121474385956 is a deficient number, since it is larger than the sum of its proper divisors (11341119399693).

15121474385956 is an frugal number, since it uses more digits than its factorization.

15121474385956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888638 (or 1944319 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 61.

The spelling of 15121474385956 in words is "fifteen trillion, one hundred twenty-one billion, four hundred seventy-four million, three hundred eighty-five thousand, nine hundred fifty-six".