645257677315 has 16 divisors (see below), whose sum is σ = 843167930400. Its totient is φ = 472174036992.

The previous prime is 645257677313. The next prime is 645257677331. The reversal of 645257677315 is 513776752546.

It is a cyclic number.

It is not a de Polignac number, because 645257677315 - 2¹ = 645257677313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645257677315.

It is not an unprimeable number, because it can be changed into a prime (645257677313) 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, 117103902 + ... + 117109411.

It is an arithmetic number, because the mean of its divisors is an integer number (52697995650).

Almost surely, 2^645257677315 is an apocalyptic number.

645257677315 is a deficient number, since it is larger than the sum of its proper divisors (197910253085).

645257677315 is a wasteful number, since it uses less digits than its factorization.

645257677315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234213366.

The product of its digits is 37044000, while the sum is 58.

The spelling of 645257677315 in words is "six hundred forty-five billion, two hundred fifty-seven million, six hundred seventy-seven thousand, three hundred fifteen".