51331697747 has 24 divisors (see below), whose sum is σ = 59469545520. Its totient is φ = 44205761600.

The previous prime is 51331697743. The next prime is 51331697803. The reversal of 51331697747 is 74779613315.

It is not a de Polignac number, because 51331697747 - 2² = 51331697743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (51331697743) 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, 47972 + ... + 323982.

It is an arithmetic number, because the mean of its divisors is an integer number (2477897730).

Almost surely, 2^51331697747 is an apocalyptic number.

51331697747 is a deficient number, since it is larger than the sum of its proper divisors (8137847773).

51331697747 is a wasteful number, since it uses less digits than its factorization.

51331697747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276115 (or 276104 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 53.

The spelling of 51331697747 in words is "fifty-one billion, three hundred thirty-one million, six hundred ninety-seven thousand, seven hundred forty-seven".