646381112078 has 8 divisors (see below), whose sum is σ = 1044154104168. Its totient is φ = 298329744024.

The previous prime is 646381112021. The next prime is 646381112087. The reversal of 646381112078 is 870211183646.

646381112078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12430405976 + ... + 12430406027.

It is an arithmetic number, because the mean of its divisors is an integer number (130519263021).

Almost surely, 2^646381112078 is an apocalyptic number.

646381112078 is a deficient number, since it is larger than the sum of its proper divisors (397772992090).

646381112078 is a wasteful number, since it uses less digits than its factorization.

646381112078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24860812018.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 646381112078 in words is "six hundred forty-six billion, three hundred eighty-one million, one hundred twelve thousand, seventy-eight".