11917564013 has 8 divisors (see below), whose sum is σ = 12237252216. Its totient is φ = 11599257600.

The previous prime is 11917563997. The next prime is 11917564037. The reversal of 11917564013 is 31046571911.

It can be written as a sum of positive squares in 4 ways, for example, as 1172583049 + 10744980964 = 34243^2 + 103658^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11917564013 - 2⁴ = 11917563997 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 (11917564063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327956 + ... + 362477.

It is an arithmetic number, because the mean of its divisors is an integer number (1529656527).

Almost surely, 2^11917564013 is an apocalyptic number.

It is an amenable number.

11917564013 is a deficient number, since it is larger than the sum of its proper divisors (319688203).

11917564013 is an equidigital number, since it uses as much as digits as its factorization.

11917564013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690895.

The product of its (nonzero) digits is 22680, while the sum is 38.

The spelling of 11917564013 in words is "eleven billion, nine hundred seventeen million, five hundred sixty-four thousand, thirteen".