51356356420 has 24 divisors (see below), whose sum is σ = 107884151424. Its totient is φ = 20535722976.

The previous prime is 51356356399. The next prime is 51356356439. The reversal of 51356356420 is 2465365315.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364254 + ... + 485173.

It is an arithmetic number, because the mean of its divisors is an integer number (4495172976).

Almost surely, 2^51356356420 is an apocalyptic number.

It is an amenable number.

51356356420 is an abundant number, since it is smaller than the sum of its proper divisors (56527795004).

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

51356356420 is a wasteful number, since it uses less digits than its factorization.

51356356420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852459 (or 852457 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 40.

The spelling of 51356356420 in words is "fifty-one billion, three hundred fifty-six million, three hundred fifty-six thousand, four hundred twenty".