11231561645 has 8 divisors (see below), whose sum is σ = 13479809400. Its totient is φ = 8983959040.

The previous prime is 11231561629. The next prime is 11231561647. The reversal of 11231561645 is 54616513211.

It can be written as a sum of positive squares in 4 ways, for example, as 1115426404 + 10116135241 = 33398^2 + 100579^2 .

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

It is not a de Polignac number, because 11231561645 - 2⁴ = 11231561629 is a prime.

It is a super-3 number, since 3×11231561645³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231561647) 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, 122120 + ... + 193329.

It is an arithmetic number, because the mean of its divisors is an integer number (1684976175).

Almost surely, 2^11231561645 is an apocalyptic number.

It is an amenable number.

11231561645 is a deficient number, since it is larger than the sum of its proper divisors (2248247755).

11231561645 is an equidigital number, since it uses as much as digits as its factorization.

11231561645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322575.

The product of its digits is 21600, while the sum is 35.

The spelling of 11231561645 in words is "eleven billion, two hundred thirty-one million, five hundred sixty-one thousand, six hundred forty-five".