645855345 has 24 divisors (see below), whose sum is σ = 1120392000. Its totient is φ = 344176416.

The previous prime is 645855337. The next prime is 645855349. The reversal of 645855345 is 543558546.

645855345 is a `hidden beast` number, since 6 + 4 + 58 + 553 + 45 = 666.

It is not a de Polignac number, because 645855345 - 2³ = 645855337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 645855345.

It is not an unprimeable number, because it can be changed into a prime (645855349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57826 + ... + 68084.

It is an arithmetic number, because the mean of its divisors is an integer number (46683000).

Almost surely, 2^645855345 is an apocalyptic number.

It is an amenable number.

645855345 is a deficient number, since it is larger than the sum of its proper divisors (474536655).

645855345 is a wasteful number, since it uses less digits than its factorization.

645855345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11669 (or 11666 counting only the distinct ones).

The product of its digits is 1440000, while the sum is 45.

The square root of 645855345 is about 25413.6842075288. The cubic root of 645855345 is about 864.3940179766.

The spelling of 645855345 in words is "six hundred forty-five million, eight hundred fifty-five thousand, three hundred forty-five".