645867425 has 12 divisors (see below), whose sum is σ = 915286656. Its totient is φ = 442880400.

The previous prime is 645867421. The next prime is 645867473. The reversal of 645867425 is 524768546.

It is not a de Polignac number, because 645867425 - 2² = 645867421 is a prime.

It is a super-2 number, since 2×645867425² = 834289461352261250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645867425.

It is not an unprimeable number, because it can be changed into a prime (645867421) 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 11 ways as a sum of consecutive naturals, for example, 1845161 + ... + 1845510.

It is an arithmetic number, because the mean of its divisors is an integer number (76273888).

Almost surely, 2^645867425 is an apocalyptic number.

It is an amenable number.

645867425 is a deficient number, since it is larger than the sum of its proper divisors (269419231).

645867425 is a wasteful number, since it uses less digits than its factorization.

645867425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690688 (or 3690683 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 47.

The square root of 645867425 is about 25413.9218736503. The cubic root of 645867425 is about 864.3994071166.

The spelling of 645867425 in words is "six hundred forty-five million, eight hundred sixty-seven thousand, four hundred twenty-five".