645216374089 has 8 divisors (see below), whose sum is σ = 776200149440. Its totient is φ = 523935100656.

The previous prime is 645216374057. The next prime is 645216374129. The reversal of 645216374089 is 980473612546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645216374089 - 2⁵ = 645216374057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645216374489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2425625334 + ... + 2425625599.

It is an arithmetic number, because the mean of its divisors is an integer number (97025018680).

It is a 1-persistent number, because it is pandigital, but 2⋅645216374089 = 1290432748178 is not.

Almost surely, 2^645216374089 is an apocalyptic number.

It is an amenable number.

645216374089 is a deficient number, since it is larger than the sum of its proper divisors (130983775351).

645216374089 is a wasteful number, since it uses less digits than its factorization.

645216374089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4851250959.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 645216374089 in words is "six hundred forty-five billion, two hundred sixteen million, three hundred seventy-four thousand, eighty-nine".