645295499 has 8 divisors (see below), whose sum is σ = 688826880. Its totient is φ = 602721000.

The previous prime is 645295487. The next prime is 645295513. The reversal of 645295499 is 994592546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645295499 - 2⁸ = 645295243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645295499.

It is not an unprimeable number, because it can be changed into a prime (645295099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237827 + ... + 240524.

It is an arithmetic number, because the mean of its divisors is an integer number (86103360).

Almost surely, 2^645295499 is an apocalyptic number.

645295499 is a deficient number, since it is larger than the sum of its proper divisors (43531381).

645295499 is a wasteful number, since it uses less digits than its factorization.

645295499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478441.

The product of its digits is 3499200, while the sum is 53.

The square root of 645295499 is about 25402.6671631150. The cubic root of 645295499 is about 864.1441852383.

The spelling of 645295499 in words is "six hundred forty-five million, two hundred ninety-five thousand, four hundred ninety-nine".