51919879651 has 2 divisors, whose sum is σ = 51919879652. Its totient is φ = 51919879650.

The previous prime is 51919879643. The next prime is 51919879703. The reversal of 51919879651 is 15697891915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51919879651 - 2³ = 51919879643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51919879651.

It is not a weakly prime, because it can be changed into another prime (51911879651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25959939825 + 25959939826.

It is an arithmetic number, because the mean of its divisors is an integer number (25959939826).

Almost surely, 2^51919879651 is an apocalyptic number.

51919879651 is a deficient number, since it is larger than the sum of its proper divisors (1).

51919879651 is an equidigital number, since it uses as much as digits as its factorization.

51919879651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6123600, while the sum is 61.

The spelling of 51919879651 in words is "fifty-one billion, nine hundred nineteen million, eight hundred seventy-nine thousand, six hundred fifty-one".