51401720475 has 48 divisors (see below), whose sum is σ = 107916426240. Its totient is φ = 23497927200.

The previous prime is 51401720473. The next prime is 51401720519. The reversal of 51401720475 is 57402710415.

51401720475 is a `hidden beast` number, since 5 + 14 + 0 + 172 + 0 + 475 = 666.

It is not a de Polignac number, because 51401720475 - 2¹ = 51401720473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51401720473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5434611 + ... + 5444060.

It is an arithmetic number, because the mean of its divisors is an integer number (2248258880).

Almost surely, 2^51401720475 is an apocalyptic number.

51401720475 is an abundant number, since it is smaller than the sum of its proper divisors (56514705765).

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

51401720475 is a wasteful number, since it uses less digits than its factorization.

51401720475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10878697 (or 10878686 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The spelling of 51401720475 in words is "fifty-one billion, four hundred one million, seven hundred twenty thousand, four hundred seventy-five".