645206167 has 2 divisors, whose sum is σ = 645206168. Its totient is φ = 645206166.

The previous prime is 645206137. The next prime is 645206173. The reversal of 645206167 is 761602546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645206167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645206137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322603083 + 322603084.

It is an arithmetic number, because the mean of its divisors is an integer number (322603084).

Almost surely, 2^645206167 is an apocalyptic number.

645206167 is a deficient number, since it is larger than the sum of its proper divisors (1).

645206167 is an equidigital number, since it uses as much as digits as its factorization.

645206167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 645206167 is about 25400.9087829550. The cubic root of 645206167 is about 864.1043072336.

The spelling of 645206167 in words is "six hundred forty-five million, two hundred six thousand, one hundred sixty-seven".