645168707 has 2 divisors, whose sum is σ = 645168708. Its totient is φ = 645168706.

The previous prime is 645168703. The next prime is 645168749. The reversal of 645168707 is 707861546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645168707 - 2² = 645168703 is a prime.

It is not a weakly prime, because it can be changed into another prime (645168703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322584353 + 322584354.

It is an arithmetic number, because the mean of its divisors is an integer number (322584354).

Almost surely, 2^645168707 is an apocalyptic number.

645168707 is a deficient number, since it is larger than the sum of its proper divisors (1).

645168707 is an equidigital number, since it uses as much as digits as its factorization.

645168707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 645168707 is about 25400.1713970595. The cubic root of 645168707 is about 864.0875839104.

The spelling of 645168707 in words is "six hundred forty-five million, one hundred sixty-eight thousand, seven hundred seven".