51240872679 has 4 divisors (see below), whose sum is σ = 68321163576. Its totient is φ = 34160581784.

The previous prime is 51240872671. The next prime is 51240872701. The reversal of 51240872679 is 97627804215.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51240872679 - 2³ = 51240872671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240872671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8540145444 + ... + 8540145449.

It is an arithmetic number, because the mean of its divisors is an integer number (17080290894).

Almost surely, 2^51240872679 is an apocalyptic number.

51240872679 is a deficient number, since it is larger than the sum of its proper divisors (17080290897).

51240872679 is a wasteful number, since it uses less digits than its factorization.

51240872679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17080290896.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 51240872679 in words is "fifty-one billion, two hundred forty million, eight hundred seventy-two thousand, six hundred seventy-nine".