11621754561 has 16 divisors (see below), whose sum is σ = 15573297600. Its totient is φ = 7709088000.

The previous prime is 11621754539. The next prime is 11621754581. The reversal of 11621754561 is 16545712611.

It is not a de Polignac number, because 11621754561 - 2⁶ = 11621754497 is a prime.

It is a super-2 number, since 2×11621754561² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11621754581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 782541 + ... + 797253.

It is an arithmetic number, because the mean of its divisors is an integer number (973331100).

Almost surely, 2^11621754561 is an apocalyptic number.

It is an amenable number.

11621754561 is a deficient number, since it is larger than the sum of its proper divisors (3951543039).

11621754561 is a wasteful number, since it uses less digits than its factorization.

11621754561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16016.

The product of its digits is 50400, while the sum is 39.

The spelling of 11621754561 in words is "eleven billion, six hundred twenty-one million, seven hundred fifty-four thousand, five hundred sixty-one".