640121165465337 has 32 divisors (see below), whose sum is σ = 953026721136000. Its totient is φ = 424636775075520.

The previous prime is 640121165465321. The next prime is 640121165465407. The reversal of 640121165465337 is 733564561121046.

640121165465337 is a `hidden beast` number, since 6 + 4 + 0 + 1 + 2 + 1 + 1 + 65 + 46 + 533 + 7 = 666.

It is not a de Polignac number, because 640121165465337 - 2⁴ = 640121165465321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640121165465437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48446662 + ... + 60227247.

It is an arithmetic number, because the mean of its divisors is an integer number (29782085035500).

Almost surely, 2^{640121165465337} is an apocalyptic number.

It is an amenable number.

640121165465337 is a deficient number, since it is larger than the sum of its proper divisors (312905555670663).

640121165465337 is a wasteful number, since it uses less digits than its factorization.

640121165465337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108674998 (or 108674992 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 640121165465337 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-seven".