51455157499 has 2 divisors, whose sum is σ = 51455157500. Its totient is φ = 51455157498.

The previous prime is 51455157491. The next prime is 51455157529. The reversal of 51455157499 is 99475155415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51455157499 - 2³ = 51455157491 is a prime.

It is not a weakly prime, because it can be changed into another prime (51455157491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25727578749 + 25727578750.

It is an arithmetic number, because the mean of its divisors is an integer number (25727578750).

Almost surely, 2^51455157499 is an apocalyptic number.

51455157499 is a deficient number, since it is larger than the sum of its proper divisors (1).

51455157499 is an equidigital number, since it uses as much as digits as its factorization.

51455157499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670000, while the sum is 55.

The spelling of 51455157499 in words is "fifty-one billion, four hundred fifty-five million, one hundred fifty-seven thousand, four hundred ninety-nine".