645015895 has 16 divisors (see below), whose sum is σ = 834634080. Its totient is φ = 476928000.

The previous prime is 645015871. The next prime is 645015911. The reversal of 645015895 is 598510546.

645015895 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645015895 - 2⁹ = 645015383 is a prime.

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, 78906 + ... + 86695.

It is an arithmetic number, because the mean of its divisors is an integer number (52164630).

Almost surely, 2^645015895 is an apocalyptic number.

645015895 is a deficient number, since it is larger than the sum of its proper divisors (189618185).

645015895 is a wasteful number, since it uses less digits than its factorization.

645015895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165666.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 645015895 is about 25397.1631289796. The cubic root of 645015895 is about 864.0193571159.

The spelling of 645015895 in words is "six hundred forty-five million, fifteen thousand, eight hundred ninety-five".