11663915640 has 128 divisors (see below), whose sum is σ = 38394699840. Its totient is φ = 2816925696.

The previous prime is 11663915629. The next prime is 11663915671. The reversal of 11663915640 is 4651936611.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 11663915592 and 11663915601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12144 + ... + 153216.

Almost surely, 2^11663915640 is an apocalyptic number.

11663915640 is a gapful number since it is divisible by the number (10) 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 11663915640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19197349920).

11663915640 is an abundant number, since it is smaller than the sum of its proper divisors (26730784200).

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

11663915640 is a wasteful number, since it uses less digits than its factorization.

11663915640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141153 (or 141149 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 42.

The spelling of 11663915640 in words is "eleven billion, six hundred sixty-three million, nine hundred fifteen thousand, six hundred forty".