13316556256665 has 32 divisors (see below), whose sum is σ = 21653760368640. Its totient is φ = 6986693444544.

The previous prime is 13316556256643. The next prime is 13316556256687. The reversal of 13316556256665 is 56665265561331.

It is an interprime number because it is at equal distance from previous prime (13316556256643) and next prime (13316556256687).

It is not a de Polignac number, because 13316556256665 - 2¹⁶ = 13316556191129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13316556256599 and 13316556256608.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8222329 + ... + 9707718.

It is an arithmetic number, because the mean of its divisors is an integer number (676680011520).

Almost surely, 2^{13316556256665} is an apocalyptic number.

13316556256665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13316556256665 is a deficient number, since it is larger than the sum of its proper divisors (8337204111975).

13316556256665 is a wasteful number, since it uses less digits than its factorization.

13316556256665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17930861.

The product of its digits is 87480000, while the sum is 60.

The spelling of 13316556256665 in words is "thirteen trillion, three hundred sixteen billion, five hundred fifty-six million, two hundred fifty-six thousand, six hundred sixty-five".