1156618521913 has 4 divisors (see below), whose sum is σ = 1156867851520. Its totient is φ = 1156369192308.

The previous prime is 1156618521847. The next prime is 1156618521941. The reversal of 1156618521913 is 3191258166511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156618521913 is a prime.

It is a super-2 number, since 2×1156618521913² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156618521953) 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, 124657845 + ... + 124667122.

It is an arithmetic number, because the mean of its divisors is an integer number (289216962880).

Almost surely, 2^{1156618521913} is an apocalyptic number.

It is an amenable number.

1156618521913 is a deficient number, since it is larger than the sum of its proper divisors (249329607).

1156618521913 is an equidigital number, since it uses as much as digits as its factorization.

1156618521913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249329606.

The product of its digits is 388800, while the sum is 49.

The spelling of 1156618521913 in words is "one trillion, one hundred fifty-six billion, six hundred eighteen million, five hundred twenty-one thousand, nine hundred thirteen".