11631533421915 has 128 divisors (see below), whose sum is σ = 22739515223040. Its totient is φ = 5594218905600.

The previous prime is 11631533421889. The next prime is 11631533421919. The reversal of 11631533421915 is 51912433513611.

It is a happy number.

11631533421915 is a `hidden beast` number, since 1 + 1 + 6 + 3 + 1 + 533 + 4 + 21 + 91 + 5 = 666.

It is not a de Polignac number, because 11631533421915 - 2¹⁰ = 11631533420891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (11631533421919) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 544103707 + ... + 544125083.

It is an arithmetic number, because the mean of its divisors is an integer number (177652462680).

Almost surely, 2^{11631533421915} is an apocalyptic number.

11631533421915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11631533421915 is a deficient number, since it is larger than the sum of its proper divisors (11107981801125).

11631533421915 is a wasteful number, since it uses less digits than its factorization.

11631533421915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24330 (or 24324 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The spelling of 11631533421915 in words is "eleven trillion, six hundred thirty-one billion, five hundred thirty-three million, four hundred twenty-one thousand, nine hundred fifteen".