11565520501 has 4 divisors (see below), whose sum is σ = 11642113504. Its totient is φ = 11488927500.

The previous prime is 11565520493. The next prime is 11565520511. The reversal of 11565520501 is 10502556511.

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 not a de Polignac number, because 11565520501 - 2³ = 11565520493 is a prime.

It is a super-2 number, since 2×11565520501² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11565520511) 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, 38296275 + ... + 38296576.

It is an arithmetic number, because the mean of its divisors is an integer number (2910528376).

Almost surely, 2^11565520501 is an apocalyptic number.

It is an amenable number.

11565520501 is a deficient number, since it is larger than the sum of its proper divisors (76593003).

11565520501 is an equidigital number, since it uses as much as digits as its factorization.

11565520501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76593002.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 11565520501 in words is "eleven billion, five hundred sixty-five million, five hundred twenty thousand, five hundred one".