11621525765 has 4 divisors (see below), whose sum is σ = 13945830924. Its totient is φ = 9297220608.

The previous prime is 11621525717. The next prime is 11621525777. The reversal of 11621525765 is 56752512611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56752512611 = 50627 ⋅1120993.

It can be written as a sum of positive squares in 2 ways, for example, as 3121792129 + 8499733636 = 55873^2 + 92194^2 .

It is a cyclic number.

It is not a de Polignac number, because 11621525765 - 2¹² = 11621521669 is a prime.

It is a super-2 number, since 2×11621525765² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162152572 + ... + 1162152581.

It is an arithmetic number, because the mean of its divisors is an integer number (3486457731).

Almost surely, 2^11621525765 is an apocalyptic number.

It is an amenable number.

11621525765 is a deficient number, since it is larger than the sum of its proper divisors (2324305159).

11621525765 is an equidigital number, since it uses as much as digits as its factorization.

11621525765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324305158.

The product of its digits is 126000, while the sum is 41.

The spelling of 11621525765 in words is "eleven billion, six hundred twenty-one million, five hundred twenty-five thousand, seven hundred sixty-five".