645737061967 has 2 divisors, whose sum is σ = 645737061968. Its totient is φ = 645737061966.

The previous prime is 645737061953. The next prime is 645737061973. The reversal of 645737061967 is 769160737546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645737061967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645137061967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322868530983 + 322868530984.

It is an arithmetic number, because the mean of its divisors is an integer number (322868530984).

Almost surely, 2^645737061967 is an apocalyptic number.

645737061967 is a deficient number, since it is larger than the sum of its proper divisors (1).

645737061967 is an equidigital number, since it uses as much as digits as its factorization.

645737061967 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40007520, while the sum is 61.

The spelling of 645737061967 in words is "six hundred forty-five billion, seven hundred thirty-seven million, sixty-one thousand, nine hundred sixty-seven".