645161567 has 2 divisors, whose sum is σ = 645161568. Its totient is φ = 645161566.

The previous prime is 645161537. The next prime is 645161599. The reversal of 645161567 is 765161546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645161567 - 2⁸ = 645161311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645161537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322580783 + 322580784.

It is an arithmetic number, because the mean of its divisors is an integer number (322580784).

Almost surely, 2^645161567 is an apocalyptic number.

645161567 is a deficient number, since it is larger than the sum of its proper divisors (1).

645161567 is an equidigital number, since it uses as much as digits as its factorization.

645161567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 645161567 is about 25400.0308464380. The cubic root of 645161567 is about 864.0843963161.

The spelling of 645161567 in words is "six hundred forty-five million, one hundred sixty-one thousand, five hundred sixty-seven".