645815355 has 16 divisors (see below), whose sum is σ = 1068936480. Its totient is φ = 332557568.

The previous prime is 645815347. The next prime is 645815369. The reversal of 645815355 is 553518546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 645815355 - 2³ = 645815347 is a prime.

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, 741882 + ... + 742751.

It is an arithmetic number, because the mean of its divisors is an integer number (66808530).

Almost surely, 2^645815355 is an apocalyptic number.

645815355 is a deficient number, since it is larger than the sum of its proper divisors (423121125).

645815355 is a wasteful number, since it uses less digits than its factorization.

645815355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484670.

The product of its digits is 360000, while the sum is 42.

The square root of 645815355 is about 25412.8974145020. The cubic root of 645815355 is about 864.3761771239.

The spelling of 645815355 in words is "six hundred forty-five million, eight hundred fifteen thousand, three hundred fifty-five".