51686970971 has 4 divisors (see below), whose sum is σ = 52029268944. Its totient is φ = 51344673000.

The previous prime is 51686970949. The next prime is 51686971051. The reversal of 51686970971 is 17907968615.

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 51686970971 - 2¹⁴ = 51686954587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51686970971.

It is not an unprimeable number, because it can be changed into a prime (51686970931) 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, 171148760 + ... + 171149061.

It is an arithmetic number, because the mean of its divisors is an integer number (13007317236).

Almost surely, 2^51686970971 is an apocalyptic number.

51686970971 is a deficient number, since it is larger than the sum of its proper divisors (342297973).

51686970971 is a wasteful number, since it uses less digits than its factorization.

51686970971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342297972.

The product of its (nonzero) digits is 5715360, while the sum is 59.

The spelling of 51686970971 in words is "fifty-one billion, six hundred eighty-six million, nine hundred seventy thousand, nine hundred seventy-one".