645063615 has 32 divisors (see below), whose sum is σ = 1310607360. Its totient is φ = 294885792.

The previous prime is 645063599. The next prime is 645063637. The reversal of 645063615 is 516360546.

645063615 is a `hidden beast` number, since 6 + 4 + 5 + 0 + 636 + 15 = 666.

It is not a de Polignac number, because 645063615 - 2⁴ = 645063599 is a prime.

It is a super-2 number, since 2×645063615² = 832214134793736450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645063615.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 340359 + ... + 342248.

It is an arithmetic number, because the mean of its divisors is an integer number (40956480).

Almost surely, 2^645063615 is an apocalyptic number.

645063615 is an abundant number, since it is smaller than the sum of its proper divisors (665543745).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645063615 is a wasteful number, since it uses less digits than its factorization.

645063615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682628 (or 682622 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 645063615 is about 25398.1025866107. The cubic root of 645063615 is about 864.0406640776.

It can be divided in two parts, 64506 and 3615, that added together give a square (68121 = 261²).

The spelling of 645063615 in words is "six hundred forty-five million, sixty-three thousand, six hundred fifteen".