11655626261 has 4 divisors (see below), whose sum is σ = 11698636224. Its totient is φ = 11612616300.

The previous prime is 11655626243. The next prime is 11655626287. The reversal of 11655626261 is 16262655611.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16262655611 = 3019 ⋅5386769.

It is a cyclic number.

It is not a de Polignac number, because 11655626261 - 2¹⁴ = 11655609877 is a prime.

It is a super-2 number, since 2×11655626261² (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 (11655626201) 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, 21504575 + ... + 21505116.

It is an arithmetic number, because the mean of its divisors is an integer number (2924659056).

Almost surely, 2^11655626261 is an apocalyptic number.

It is an amenable number.

11655626261 is a deficient number, since it is larger than the sum of its proper divisors (43009963).

11655626261 is an equidigital number, since it uses as much as digits as its factorization.

11655626261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43009962.

The product of its digits is 129600, while the sum is 41.

The spelling of 11655626261 in words is "eleven billion, six hundred fifty-five million, six hundred twenty-six thousand, two hundred sixty-one".