51307166561 has 8 divisors (see below), whose sum is σ = 58648000320. Its totient is φ = 43969142448.

The previous prime is 51307166467. The next prime is 51307166563. The reversal of 51307166561 is 16566170315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-51307166561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51307166563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 663131 + ... + 736448.

It is an arithmetic number, because the mean of its divisors is an integer number (7331000040).

Almost surely, 2^51307166561 is an apocalyptic number.

It is an amenable number.

51307166561 is a deficient number, since it is larger than the sum of its proper divisors (7340833759).

51307166561 is a wasteful number, since it uses less digits than its factorization.

51307166561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404823.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 51307166561 in words is "fifty-one billion, three hundred seven million, one hundred sixty-six thousand, five hundred sixty-one".