11621555115261 has 96 divisors (see below), whose sum is σ = 20753257045248. Its totient is φ = 5713443993600.

The previous prime is 11621555115251. The next prime is 11621555115271. The reversal of 11621555115261 is 16251155512611.

It is an interprime number because it is at equal distance from previous prime (11621555115251) and next prime (11621555115271).

It is not a de Polignac number, because 11621555115261 - 2⁶ = 11621555115197 is a prime.

It is a super-2 number, since 2×11621555115261² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621555115211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1609611 + ... + 5082711.

It is an arithmetic number, because the mean of its divisors is an integer number (216179760888).

Almost surely, 2^{11621555115261} is an apocalyptic number.

It is an amenable number.

11621555115261 is a deficient number, since it is larger than the sum of its proper divisors (9131701929987).

11621555115261 is a wasteful number, since it uses less digits than its factorization.

11621555115261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3473251 (or 3473244 counting only the distinct ones).

The product of its digits is 90000, while the sum is 42.

The spelling of 11621555115261 in words is "eleven trillion, six hundred twenty-one billion, five hundred fifty-five million, one hundred fifteen thousand, two hundred sixty-one".