645343995 has 16 divisors (see below), whose sum is σ = 1033070112. Its totient is φ = 344010240.

The previous prime is 645343991. The next prime is 645343997. The reversal of 645343995 is 599343546.

It is not a de Polignac number, because 645343995 - 2² = 645343991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645343991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23475 + ... + 42915.

It is an arithmetic number, because the mean of its divisors is an integer number (64566882).

Almost surely, 2^645343995 is an apocalyptic number.

645343995 is a deficient number, since it is larger than the sum of its proper divisors (387726117).

645343995 is a wasteful number, since it uses less digits than its factorization.

645343995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21662.

The product of its digits is 1749600, while the sum is 48.

The square root of 645343995 is about 25403.6216906173. The cubic root of 645343995 is about 864.1658324199.

The spelling of 645343995 in words is "six hundred forty-five million, three hundred forty-three thousand, nine hundred ninety-five".