51651556560 has 60 divisors (see below), whose sum is σ = 173463146532. Its totient is φ = 13773748224.

The previous prime is 51651556559. The next prime is 51651556589. The reversal of 51651556560 is 6565515615.

51651556560 is a `hidden beast` number, since 5 + 16 + 5 + 15 + 565 + 60 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23596646544 + 28054910016 = 153612^2 + 167496^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35868417 + ... + 35869856.

Almost surely, 2^51651556560 is an apocalyptic number.

It is an amenable number.

51651556560 is an abundant number, since it is smaller than the sum of its proper divisors (121811589972).

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

51651556560 is a wasteful number, since it uses less digits than its factorization.

51651556560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71738292 (or 71738283 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

It can be divided in two parts, 5165155 and 6560, that added together give a palindrome (5171715).

The spelling of 51651556560 in words is "fifty-one billion, six hundred fifty-one million, five hundred fifty-six thousand, five hundred sixty".