51555155232 has 48 divisors (see below), whose sum is σ = 154665467712. Its totient is φ = 14730044160.

The previous prime is 51555155231. The next prime is 51555155273. The reversal of 51555155232 is 23255155515.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-4 number, since 4×51555155232⁴ (a number of 44 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (51555155231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38358819 + ... + 38360162.

It is an arithmetic number, because the mean of its divisors is an integer number (3222197244).

Almost surely, 2^51555155232 is an apocalyptic number.

It is an amenable number.

51555155232 is an abundant number, since it is smaller than the sum of its proper divisors (103110312480).

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

51555155232 is a wasteful number, since it uses less digits than its factorization.

51555155232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76719001 (or 76718993 counting only the distinct ones).

The product of its digits is 187500, while the sum is 39.

The spelling of 51555155232 in words is "fifty-one billion, five hundred fifty-five million, one hundred fifty-five thousand, two hundred thirty-two".