645079002709 has 8 divisors (see below), whose sum is σ = 651852031320. Its totient is φ = 638308478976.

The previous prime is 645079002671. The next prime is 645079002731. The reversal of 645079002709 is 907200970546.

645079002709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 244955704900 + 400123297809 = 494930^2 + 632553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645079002709 - 2¹⁷ = 645078871637 is a prime.

It is a super-2 number, since 2×645079002709² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645079005709) 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, 106204 + ... + 1140805.

It is an arithmetic number, because the mean of its divisors is an integer number (81481503915).

Almost surely, 2^645079002709 is an apocalyptic number.

It is an amenable number.

645079002709 is a deficient number, since it is larger than the sum of its proper divisors (6773028611).

645079002709 is a wasteful number, since it uses less digits than its factorization.

645079002709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252439.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 645079002709 in words is "six hundred forty-five billion, seventy-nine million, two thousand, seven hundred nine".