51646873291 has 24 divisors (see below), whose sum is σ = 58768177104. Its totient is φ = 45113302080.

The previous prime is 51646873277. The next prime is 51646873331. The reversal of 51646873291 is 19237864615.

51646873291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51646873291 - 2¹⁵ = 51646840523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51646873241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4438461 + ... + 4450081.

It is an arithmetic number, because the mean of its divisors is an integer number (2448674046).

Almost surely, 2^51646873291 is an apocalyptic number.

51646873291 is a deficient number, since it is larger than the sum of its proper divisors (7121303813).

51646873291 is a wasteful number, since it uses less digits than its factorization.

51646873291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12619 (or 12600 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The spelling of 51646873291 in words is "fifty-one billion, six hundred forty-six million, eight hundred seventy-three thousand, two hundred ninety-one".