51157661061 has 32 divisors (see below), whose sum is σ = 75928265728. Its totient is φ = 30425310720.

The previous prime is 51157660903. The next prime is 51157661143. The reversal of 51157661061 is 16016675115.

It is not a de Polignac number, because 51157661061 - 2²¹ = 51155563909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51157661161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 887265 + ... + 943161.

It is an arithmetic number, because the mean of its divisors is an integer number (2372758304).

Almost surely, 2^51157661061 is an apocalyptic number.

It is an amenable number.

51157661061 is a deficient number, since it is larger than the sum of its proper divisors (24770604667).

51157661061 is a wasteful number, since it uses less digits than its factorization.

51157661061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56701.

The product of its (nonzero) digits is 37800, while the sum is 39.

The spelling of 51157661061 in words is "fifty-one billion, one hundred fifty-seven million, six hundred sixty-one thousand, sixty-one".