51242166717 has 32 divisors (see below), whose sum is σ = 87027840000. Its totient is φ = 26108345088.

The previous prime is 51242166709. The next prime is 51242166721. The reversal of 51242166717 is 71766124215.

It is not a de Polignac number, because 51242166717 - 2³ = 51242166709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51242166737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3770467 + ... + 3784032.

It is an arithmetic number, because the mean of its divisors is an integer number (2719620000).

Almost surely, 2^51242166717 is an apocalyptic number.

51242166717 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

It is an amenable number.

51242166717 is a deficient number, since it is larger than the sum of its proper divisors (35785673283).

51242166717 is a wasteful number, since it uses less digits than its factorization.

51242166717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7554545.

The product of its digits is 141120, while the sum is 42.

The spelling of 51242166717 in words is "fifty-one billion, two hundred forty-two million, one hundred sixty-six thousand, seven hundred seventeen".