645450526 has 16 divisors (see below), whose sum is σ = 1171574496. Its totient is φ = 260349696.

The previous prime is 645450523. The next prime is 645450529. The reversal of 645450526 is 625054546.

It is an interprime number because it is at equal distance from previous prime (645450523) and next prime (645450529).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645450523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1355751 + ... + 1356226.

It is an arithmetic number, because the mean of its divisors is an integer number (73223406).

Almost surely, 2^645450526 is an apocalyptic number.

645450526 is a deficient number, since it is larger than the sum of its proper divisors (526123970).

645450526 is a wasteful number, since it uses less digits than its factorization.

645450526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712003.

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 645450526 is about 25405.7183720516. The cubic root of 645450526 is about 864.2133809035.

The spelling of 645450526 in words is "six hundred forty-five million, four hundred fifty thousand, five hundred twenty-six".