645416679 has 16 divisors (see below), whose sum is σ = 912015072. Its totient is φ = 404594688.

The previous prime is 645416677. The next prime is 645416689. The reversal of 645416679 is 976614546.

It is not a de Polignac number, because 645416679 - 2¹ = 645416677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645416677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56647 + ... + 67079.

It is an arithmetic number, because the mean of its divisors is an integer number (57000942).

Almost surely, 2^645416679 is an apocalyptic number.

645416679 is a deficient number, since it is larger than the sum of its proper divisors (266598393).

645416679 is a wasteful number, since it uses less digits than its factorization.

645416679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11666.

The product of its digits is 1088640, while the sum is 48.

The square root of 645416679 is about 25405.0522337585. The cubic root of 645416679 is about 864.1982743795.

The spelling of 645416679 in words is "six hundred forty-five million, four hundred sixteen thousand, six hundred seventy-nine".