625921491659 has 2 divisors, whose sum is σ = 625921491660. Its totient is φ = 625921491658.

The previous prime is 625921491649. The next prime is 625921491697. The reversal of 625921491659 is 956194129526.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625921491659 - 2³⁶ = 557202014923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 625921491598 and 625921491607.

It is not a weakly prime, because it can be changed into another prime (625921491649) 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, 312960745829 + 312960745830.

It is an arithmetic number, because the mean of its divisors is an integer number (312960745830).

Almost surely, 2^625921491659 is an apocalyptic number.

625921491659 is a deficient number, since it is larger than the sum of its proper divisors (1).

625921491659 is an equidigital number, since it uses as much as digits as its factorization.

625921491659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10497600, while the sum is 59.

The spelling of 625921491659 in words is "six hundred twenty-five billion, nine hundred twenty-one million, four hundred ninety-one thousand, six hundred fifty-nine".