667974475378 has 8 divisors (see below), whose sum is σ = 1145099100672. Its totient is φ = 286274775156.

The previous prime is 667974475373. The next prime is 667974475381. The reversal of 667974475378 is 873574479766.

667974475378 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 self number, because there is not a number n which added to its sum of digits gives 667974475378.

It is not an unprimeable number, because it can be changed into a prime (667974475373) 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, 23856231250 + ... + 23856231277.

It is an arithmetic number, because the mean of its divisors is an integer number (143137387584).

Almost surely, 2^667974475378 is an apocalyptic number.

667974475378 is a deficient number, since it is larger than the sum of its proper divisors (477124625294).

667974475378 is a wasteful number, since it uses less digits than its factorization.

667974475378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47712462536.

The product of its digits is 1493614080, while the sum is 73.

The spelling of 667974475378 in words is "six hundred sixty-seven billion, nine hundred seventy-four million, four hundred seventy-five thousand, three hundred seventy-eight".