11621356656 has 300 divisors, whose sum is σ = 38052231912. Its totient is φ = 3047256576.

The previous prime is 11621356639. The next prime is 11621356657. The reversal of 11621356656 is 65665312611.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11621356657) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 67175386 + ... + 67175558.

Almost surely, 2^11621356656 is an apocalyptic number.

11621356656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11621356656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19026115956).

11621356656 is an abundant number, since it is smaller than the sum of its proper divisors (26430875256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11621356656 is an equidigital number, since it uses as much as digits as its factorization.

11621356656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 198 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The spelling of 11621356656 in words is "eleven billion, six hundred twenty-one million, three hundred fifty-six thousand, six hundred fifty-six".