12615396897856 has 63 divisors (see below), whose sum is σ = 25263605732911. Its totient is φ = 6250286895104.

The previous prime is 12615396897797. The next prime is 12615396897869. The reversal of 12615396897856 is 65879869351621.

The square root of 12615396897856 is 3551816.

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

It can be written as a sum of positive squares in 4 ways, for example, as 9510809281600 + 3104587616256 = 3083960^2 + 1761984^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3210839700 + ... + 3210843628.

Almost surely, 2^{12615396897856} is an apocalyptic number.

12615396897856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

12615396897856 is the 3551816-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12615396897856

12615396897856 is an abundant number, since it is smaller than the sum of its proper divisors (12648208835055).

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

12615396897856 is an frugal number, since it uses more digits than its factorization.

12615396897856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8096 (or 4044 counting only the distinct ones).

The product of its digits is 1175731200, while the sum is 76.

The spelling of 12615396897856 in words is "twelve trillion, six hundred fifteen billion, three hundred ninety-six million, eight hundred ninety-seven thousand, eight hundred fifty-six".