640121165465336 has 32 divisors (see below), whose sum is σ = 1281536812575360. Its totient is φ = 299025256260192.

The previous prime is 640121165465321. The next prime is 640121165465407. The reversal of 640121165465336 is 633564561121046.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40452542990 + ... + 40452558813.

It is an arithmetic number, because the mean of its divisors is an integer number (40048025392980).

Almost surely, 2^{640121165465336} is an apocalyptic number.

It is an amenable number.

640121165465336 is an abundant number, since it is smaller than the sum of its proper divisors (641415647110024).

640121165465336 is a wasteful number, since it uses less digits than its factorization.

640121165465336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80905101875 (or 80905101871 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 53.

The spelling of 640121165465336 in words is "six hundred forty trillion, one hundred twenty-one billion, one hundred sixty-five million, four hundred sixty-five thousand, three hundred thirty-six".