51421998079 has 2 divisors, whose sum is σ = 51421998080. Its totient is φ = 51421998078.

The previous prime is 51421998077. The next prime is 51421998113. The reversal of 51421998079 is 97089912415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51421998079 - 2¹ = 51421998077 is a prime.

Together with 51421998077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51421998073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25710999039 + 25710999040.

It is an arithmetic number, because the mean of its divisors is an integer number (25710999040).

Almost surely, 2^51421998079 is an apocalyptic number.

51421998079 is a deficient number, since it is larger than the sum of its proper divisors (1).

51421998079 is an equidigital number, since it uses as much as digits as its factorization.

51421998079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 51421998079 in words is "fifty-one billion, four hundred twenty-one million, nine hundred ninety-eight thousand, seventy-nine".