51295991961 has 16 divisors (see below), whose sum is σ = 71912986560. Its totient is φ = 32476825920.

The previous prime is 51295991959. The next prime is 51295991977. The reversal of 51295991961 is 16919959215.

It is not a de Polignac number, because 51295991961 - 2¹ = 51295991959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51295991911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4827555 + ... + 4838168.

It is an arithmetic number, because the mean of its divisors is an integer number (4494561660).

Almost surely, 2^51295991961 is an apocalyptic number.

It is an amenable number.

51295991961 is a deficient number, since it is larger than the sum of its proper divisors (20616994599).

51295991961 is a wasteful number, since it uses less digits than its factorization.

51295991961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9665816.

The product of its digits is 1968300, while the sum is 57.

The spelling of 51295991961 in words is "fifty-one billion, two hundred ninety-five million, nine hundred ninety-one thousand, nine hundred sixty-one".