645330967 has 4 divisors (see below), whose sum is σ = 656268840. Its totient is φ = 634393096.

The previous prime is 645330943. The next prime is 645330977. The reversal of 645330967 is 769033546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 769033546 = 2 ⋅384516773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645330967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645330977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5468848 + ... + 5468965.

It is an arithmetic number, because the mean of its divisors is an integer number (164067210).

Almost surely, 2^645330967 is an apocalyptic number.

645330967 is a deficient number, since it is larger than the sum of its proper divisors (10937873).

645330967 is a wasteful number, since it uses less digits than its factorization.

645330967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10937872.

The product of its (nonzero) digits is 408240, while the sum is 43.

The square root of 645330967 is about 25403.3652691922. The cubic root of 645330967 is about 864.1600172122.

The spelling of 645330967 in words is "six hundred forty-five million, three hundred thirty thousand, nine hundred sixty-seven".