11651533980 has 48 divisors (see below), whose sum is σ = 32635839264. Its totient is φ = 3105976320.

The previous prime is 11651533973. The next prime is 11651533981. The reversal of 11651533980 is 8933515611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11651533981) 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, 144300 + ... + 210060.

It is an arithmetic number, because the mean of its divisors is an integer number (679913318).

Almost surely, 2^11651533980 is an apocalyptic number.

11651533980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11651533980 is an abundant number, since it is smaller than the sum of its proper divisors (20984305284).

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

11651533980 is a wasteful number, since it uses less digits than its factorization.

11651533980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68726 (or 68724 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 42.

The spelling of 11651533980 in words is "eleven billion, six hundred fifty-one million, five hundred thirty-three thousand, nine hundred eighty".