51643474560 has 160 divisors (see below), whose sum is σ = 184428357300. Its totient is φ = 13771579392.

The previous prime is 51643474541. The next prime is 51643474577. The reversal of 51643474560 is 6547434615.

51643474560 is a `hidden beast` number, since 5 + 1 + 6 + 43 + 47 + 4 + 560 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 44413033536 + 7230441024 = 210744^2 + 85032^2 .

It is a tau number, because it is divible by the number of its divisors (160).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 446265 + ... + 549944.

Almost surely, 2^51643474560 is an apocalyptic number.

It is an amenable number.

51643474560 is an abundant number, since it is smaller than the sum of its proper divisors (132784882740).

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

51643474560 is an equidigital number, since it uses as much as digits as its factorization.

51643474560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996240 (or 996219 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 51643474560 in words is "fifty-one billion, six hundred forty-three million, four hundred seventy-four thousand, five hundred sixty".