645413265 has 80 divisors (see below), whose sum is σ = 1336444032. Its totient is φ = 291879936.

The previous prime is 645413243. The next prime is 645413287. The reversal of 645413265 is 562314546.

645413265 is a `hidden beast` number, since 645 + 4 + 1 + 3 + 2 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (645413243) and next prime (645413287).

It is not a de Polignac number, because 645413265 - 2⁹ = 645412753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 273822 + ... + 276168.

Almost surely, 2^645413265 is an apocalyptic number.

It is an amenable number.

645413265 is an abundant number, since it is smaller than the sum of its proper divisors (691030767).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645413265 is a wasteful number, since it uses less digits than its factorization.

645413265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468 (or 2459 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 645413265 is about 25404.9850423101. The cubic root of 645413265 is about 864.1967506207.

The spelling of 645413265 in words is "six hundred forty-five million, four hundred thirteen thousand, two hundred sixty-five".