51215330642620 has 12 divisors (see below), whose sum is σ = 107552194349544. Its totient is φ = 20486132257040.

The previous prime is 51215330642591. The next prime is 51215330642713. The reversal of 51215330642620 is 2624603351215.

It is a super-2 number, since 2×51215330642620² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280383266046 + ... + 1280383266085.

It is an arithmetic number, because the mean of its divisors is an integer number (8962682862462).

Almost surely, 2^{51215330642620} is an apocalyptic number.

It is an amenable number.

51215330642620 is an abundant number, since it is smaller than the sum of its proper divisors (56336863706924).

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

51215330642620 is a wasteful number, since it uses less digits than its factorization.

51215330642620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560766532140 (or 2560766532138 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 51215330642620 its reverse (2624603351215), we get a palindrome (53839933993835).

The spelling of 51215330642620 in words is "fifty-one trillion, two hundred fifteen billion, three hundred thirty million, six hundred forty-two thousand, six hundred twenty".