51853218697 has 6 divisors (see below), whose sum is σ = 60319050378. Its totient is φ = 44445615984.

The previous prime is 51853218689. The next prime is 51853218709. The reversal of 51853218697 is 79681235815.

It can be written as a sum of positive squares in only one way, i.e., 45665980416 + 6187238281 = 213696^2 + 78659^2 .

It is not a de Polignac number, because 51853218697 - 2³ = 51853218689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51853218607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 529114428 + ... + 529114525.

It is an arithmetic number, because the mean of its divisors is an integer number (10053175063).

Almost surely, 2^51853218697 is an apocalyptic number.

It is an amenable number.

51853218697 is a deficient number, since it is larger than the sum of its proper divisors (8465831681).

51853218697 is a wasteful number, since it uses less digits than its factorization.

51853218697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058228967 (or 1058228960 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 55.

The spelling of 51853218697 in words is "fifty-one billion, eight hundred fifty-three million, two hundred eighteen thousand, six hundred ninety-seven".