645563067 has 4 divisors (see below), whose sum is σ = 860750760. Its totient is φ = 430375376.

The previous prime is 645563063. The next prime is 645563069. The reversal of 645563067 is 760365546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645563067 - 2² = 645563063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645563063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107593842 + ... + 107593847.

It is an arithmetic number, because the mean of its divisors is an integer number (215187690).

Almost surely, 2^645563067 is an apocalyptic number.

645563067 is a deficient number, since it is larger than the sum of its proper divisors (215187693).

645563067 is a wasteful number, since it uses less digits than its factorization.

645563067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215187692.

The product of its (nonzero) digits is 453600, while the sum is 42.

The square root of 645563067 is about 25407.9331508881. The cubic root of 645563067 is about 864.2636061762.

The spelling of 645563067 in words is "six hundred forty-five million, five hundred sixty-three thousand, sixty-seven".