11565671257051 has 4 divisors (see below), whose sum is σ = 11572093064104. Its totient is φ = 11559249450000.

The previous prime is 11565671257037. The next prime is 11565671257057. The reversal of 11565671257051 is 15075217656511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11565671257051 - 2⁹ = 11565671256539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11565671257051.

It is not an unprimeable number, because it can be changed into a prime (11565671257057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3210900825 + ... + 3210904426.

It is an arithmetic number, because the mean of its divisors is an integer number (2893023266026).

Almost surely, 2^{11565671257051} is an apocalyptic number.

11565671257051 is a deficient number, since it is larger than the sum of its proper divisors (6421807053).

11565671257051 is an equidigital number, since it uses as much as digits as its factorization.

11565671257051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6421807052.

The product of its (nonzero) digits is 2205000, while the sum is 52.

The spelling of 11565671257051 in words is "eleven trillion, five hundred sixty-five billion, six hundred seventy-one million, two hundred fifty-seven thousand, fifty-one".