645268965 has 32 divisors (see below), whose sum is σ = 1152493056. Its totient is φ = 305578560.

The previous prime is 645268961. The next prime is 645268993. The reversal of 645268965 is 569862546.

645268965 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 645268965 - 2² = 645268961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645268961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38379 + ... + 52568.

It is an arithmetic number, because the mean of its divisors is an integer number (36015408).

Almost surely, 2^645268965 is an apocalyptic number.

It is an amenable number.

645268965 is a deficient number, since it is larger than the sum of its proper divisors (507224091).

645268965 is a wasteful number, since it uses less digits than its factorization.

645268965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91009.

The product of its digits is 3110400, while the sum is 51.

The square root of 645268965 is about 25402.1448897529. The cubic root of 645268965 is about 864.1323407856.

The spelling of 645268965 in words is "six hundred forty-five million, two hundred sixty-eight thousand, nine hundred sixty-five".