51491451659 has 2 divisors, whose sum is σ = 51491451660. Its totient is φ = 51491451658.

The previous prime is 51491451631. The next prime is 51491451689. The reversal of 51491451659 is 95615419415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51491451659 - 2²⁴ = 51474674443 is a prime.

It is a super-2 number, since 2×51491451659² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51491451689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25745725829 + 25745725830.

It is an arithmetic number, because the mean of its divisors is an integer number (25745725830).

Almost surely, 2^51491451659 is an apocalyptic number.

51491451659 is a deficient number, since it is larger than the sum of its proper divisors (1).

51491451659 is an equidigital number, since it uses as much as digits as its factorization.

51491451659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 50.

The spelling of 51491451659 in words is "fifty-one billion, four hundred ninety-one million, four hundred fifty-one thousand, six hundred fifty-nine".