645736398958 has 32 divisors (see below), whose sum is σ = 1149963982848. Its totient is φ = 266111071200.

The previous prime is 645736398953. The next prime is 645736399001. The reversal of 645736398958 is 859893637546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645736398953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4670308 + ... + 4806583.

It is an arithmetic number, because the mean of its divisors is an integer number (35936374464).

Almost surely, 2^645736398958 is an apocalyptic number.

645736398958 is a deficient number, since it is larger than the sum of its proper divisors (504227583890).

645736398958 is a wasteful number, since it uses less digits than its factorization.

645736398958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9477088.

The product of its digits is 1175731200, while the sum is 73.

The spelling of 645736398958 in words is "six hundred forty-five billion, seven hundred thirty-six million, three hundred ninety-eight thousand, nine hundred fifty-eight".