645517502 has 16 divisors (see below), whose sum is σ = 1107531360. Its totient is φ = 276417888.

The previous prime is 645517501. The next prime is 645517549. The reversal of 645517502 is 205715546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645517501) 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, 1553 + ... + 35964.

It is an arithmetic number, because the mean of its divisors is an integer number (69220710).

Almost surely, 2^645517502 is an apocalyptic number.

645517502 is a deficient number, since it is larger than the sum of its proper divisors (462013858).

645517502 is a wasteful number, since it uses less digits than its factorization.

645517502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38755.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 645517502 is about 25407.0364663020. The cubic root of 645517502 is about 864.2432719389.

The spelling of 645517502 in words is "six hundred forty-five million, five hundred seventeen thousand, five hundred two".