645465255 has 16 divisors (see below), whose sum is σ = 1057934304. Its totient is φ = 335851520.

The previous prime is 645465211. The next prime is 645465263. The reversal of 645465255 is 552564546.

It is a happy number.

It is not a de Polignac number, because 645465255 - 2⁸ = 645464999 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524154 + ... + 525383.

It is an arithmetic number, because the mean of its divisors is an integer number (66120894).

Almost surely, 2^645465255 is an apocalyptic number.

645465255 is a deficient number, since it is larger than the sum of its proper divisors (412469049).

645465255 is a wasteful number, since it uses less digits than its factorization.

645465255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049586.

The product of its digits is 720000, while the sum is 42.

The square root of 645465255 is about 25406.0082460823. The cubic root of 645465255 is about 864.2199545559.

The spelling of 645465255 in words is "six hundred forty-five million, four hundred sixty-five thousand, two hundred fifty-five".