51605340515620 has 24 divisors (see below), whose sum is σ = 108371433167424. Its totient is φ = 20642094666336.

The previous prime is 51605340515587. The next prime is 51605340515633. The reversal of 51605340515620 is 2651504350615.

It is a happy number.

It is a super-2 number, since 2×51605340515620² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8813707 + ... + 13449613.

It is an arithmetic number, because the mean of its divisors is an integer number (4515476381976).

Almost surely, 2^{51605340515620} is an apocalyptic number.

It is an amenable number.

51605340515620 is an abundant number, since it is smaller than the sum of its proper divisors (56766092651804).

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

51605340515620 is a wasteful number, since it uses less digits than its factorization.

51605340515620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5192499 (or 5192497 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 51605340515620 in words is "fifty-one trillion, six hundred five billion, three hundred forty million, five hundred fifteen thousand, six hundred twenty".