51613566164 has 24 divisors (see below), whose sum is σ = 90532928808. Its totient is φ = 25747061760.

The previous prime is 51613566143. The next prime is 51613566167. The reversal of 51613566164 is 46166531615.

It can be written as a sum of positive squares in 4 ways, for example, as 103632400 + 51509933764 = 10180^2 + 226958^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51613566167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6264992 + ... + 6273224.

It is an arithmetic number, because the mean of its divisors is an integer number (3772205367).

Almost surely, 2^51613566164 is an apocalyptic number.

It is an amenable number.

51613566164 is a deficient number, since it is larger than the sum of its proper divisors (38919362644).

51613566164 is a wasteful number, since it uses less digits than its factorization.

51613566164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11675 (or 11673 counting only the distinct ones).

The product of its digits is 388800, while the sum is 44.

The spelling of 51613566164 in words is "fifty-one billion, six hundred thirteen million, five hundred sixty-six thousand, one hundred sixty-four".