51911867999 has 2 divisors, whose sum is σ = 51911868000. Its totient is φ = 51911867998.

The previous prime is 51911867993. The next prime is 51911868007. The reversal of 51911867999 is 99976811915.

51911867999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51911867999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51911867993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25955933999 + 25955934000.

It is an arithmetic number, because the mean of its divisors is an integer number (25955934000).

Almost surely, 2^51911867999 is an apocalyptic number.

51911867999 is a deficient number, since it is larger than the sum of its proper divisors (1).

51911867999 is an equidigital number, since it uses as much as digits as its factorization.

51911867999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 65.

The spelling of 51911867999 in words is "fifty-one billion, nine hundred eleven million, eight hundred sixty-seven thousand, nine hundred ninety-nine".