51720521074 has 16 divisors (see below), whose sum is σ = 77925358656. Its totient is φ = 25745655600.

The previous prime is 51720521033. The next prime is 51720521113. The reversal of 51720521074 is 47012502715.

It is a super-2 number, since 2×51720521074² (a number of 22 digits) contains 22 as substring.

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, 346989 + ... + 473119.

It is an arithmetic number, because the mean of its divisors is an integer number (4870334916).

Almost surely, 2^51720521074 is an apocalyptic number.

51720521074 is a deficient number, since it is larger than the sum of its proper divisors (26204837582).

51720521074 is a wasteful number, since it uses less digits than its factorization.

51720521074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127041.

The product of its (nonzero) digits is 19600, while the sum is 34.

The spelling of 51720521074 in words is "fifty-one billion, seven hundred twenty million, five hundred twenty-one thousand, seventy-four".