645013850867 has 4 divisors (see below), whose sum is σ = 654640923336. Its totient is φ = 635386778400.

The previous prime is 645013850857. The next prime is 645013850947. The reversal of 645013850867 is 768058310546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645013850867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645013850857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4813536134 + ... + 4813536267.

It is an arithmetic number, because the mean of its divisors is an integer number (163660230834).

Almost surely, 2^645013850867 is an apocalyptic number.

645013850867 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

645013850867 is a deficient number, since it is larger than the sum of its proper divisors (9627072469).

645013850867 is an equidigital number, since it uses as much as digits as its factorization.

645013850867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9627072468.

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 645013850867 in words is "six hundred forty-five billion, thirteen million, eight hundred fifty thousand, eight hundred sixty-seven".