640815319166 has 8 divisors (see below), whose sum is σ = 1048606885944. Its totient is φ = 291279690520.

The previous prime is 640815319129. The next prime is 640815319247. The reversal of 640815319166 is 661913518046.

640815319166 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, 14563984505 + ... + 14563984548.

It is an arithmetic number, because the mean of its divisors is an integer number (131075860743).

Almost surely, 2^640815319166 is an apocalyptic number.

640815319166 is a deficient number, since it is larger than the sum of its proper divisors (407791566778).

640815319166 is a wasteful number, since it uses less digits than its factorization.

640815319166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29127969066.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 640815319166 in words is "six hundred forty billion, eight hundred fifteen million, three hundred nineteen thousand, one hundred sixty-six".