51352511231781 has 24 divisors (see below), whose sum is σ = 74221906397184. Its totient is φ = 34213757114880.

The previous prime is 51352511231713. The next prime is 51352511231843. The reversal of 51352511231781 is 18713211525315.

It is a happy number.

51352511231781 is a `hidden beast` number, since 5 + 1 + 3 + 5 + 251 + 1 + 2 + 317 + 81 = 666.

It is not a de Polignac number, because 51352511231781 - 2²² = 51352507037477 is a prime.

It is a super-2 number, since 2×51352511231781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51352511231081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93771100 + ... + 94317146.

It is an arithmetic number, because the mean of its divisors is an integer number (3092579433216).

Almost surely, 2^{51352511231781} is an apocalyptic number.

It is an amenable number.

51352511231781 is a deficient number, since it is larger than the sum of its proper divisors (22869395165403).

51352511231781 is a wasteful number, since it uses less digits than its factorization.

51352511231781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552521 (or 552518 counting only the distinct ones).

The product of its digits is 252000, while the sum is 45.

The spelling of 51352511231781 in words is "fifty-one trillion, three hundred fifty-two billion, five hundred eleven million, two hundred thirty-one thousand, seven hundred eighty-one".