51967513665 has 12 divisors (see below), whose sum is σ = 90077023764. Its totient is φ = 27716007264.

The previous prime is 51967513621. The next prime is 51967513687. The reversal of 51967513665 is 56631576915.

51967513665 is a `hidden beast` number, since 5 + 1 + 9 + 67 + 513 + 6 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6735156624 + 45232357041 = 82068^2 + 212679^2 .

It is not a de Polignac number, because 51967513665 - 2¹² = 51967509569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 577416774 + ... + 577416863.

It is an arithmetic number, because the mean of its divisors is an integer number (7506418647).

Almost surely, 2^51967513665 is an apocalyptic number.

It is an amenable number.

51967513665 is a deficient number, since it is larger than the sum of its proper divisors (38109510099).

51967513665 is a wasteful number, since it uses less digits than its factorization.

51967513665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154833648 (or 1154833645 counting only the distinct ones).

The product of its digits is 5103000, while the sum is 54.

The spelling of 51967513665 in words is "fifty-one billion, nine hundred sixty-seven million, five hundred thirteen thousand, six hundred sixty-five".