51531533532 has 36 divisors (see below), whose sum is σ = 135084722136. Its totient is φ = 17177177520.

The previous prime is 51531533497. The next prime is 51531533561. The reversal of 51531533532 is 23533513515.

51531533532 is a `hidden beast` number, since 5 + 1 + 5 + 315 + 335 + 3 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26507019 + ... + 26508962.

Almost surely, 2^51531533532 is an apocalyptic number.

It is an amenable number.

51531533532 is an abundant number, since it is smaller than the sum of its proper divisors (83553188604).

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

51531533532 is a wasteful number, since it uses less digits than its factorization.

51531533532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53016000 (or 53015986 counting only the distinct ones).

The product of its digits is 101250, while the sum is 36.

The spelling of 51531533532 in words is "fifty-one billion, five hundred thirty-one million, five hundred thirty-three thousand, five hundred thirty-two".