645369918378 has 8 divisors (see below), whose sum is σ = 1290739836768. Its totient is φ = 215123306124.

The previous prime is 645369918313. The next prime is 645369918383. The reversal of 645369918378 is 873819963546.

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

645369918378 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 53780826526 + ... + 53780826537.

It is an arithmetic number, because the mean of its divisors is an integer number (161342479596).

Almost surely, 2^645369918378 is an apocalyptic number.

645369918378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645369918378 is a wasteful number, since it uses less digits than its factorization.

645369918378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107561653068.

The product of its digits is 235146240, while the sum is 69.

The spelling of 645369918378 in words is "six hundred forty-five billion, three hundred sixty-nine million, nine hundred eighteen thousand, three hundred seventy-eight".