6450716665778 has 256 divisors, whose sum is σ = 13151467929600. Its totient is φ = 2297555124480.

The previous prime is 6450716665777. The next prime is 6450716665829. The reversal of 6450716665778 is 8775666170546.

It is a super-2 number, since 2×6450716665778² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6450716665777) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8873062451 + ... + 8873063177.

It is an arithmetic number, because the mean of its divisors is an integer number (51372921600).

Almost surely, 2^{6450716665778} is an apocalyptic number.

6450716665778 is an abundant number, since it is smaller than the sum of its proper divisors (6700751263822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6450716665778 is a wasteful number, since it uses less digits than its factorization.

6450716665778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565.

The product of its (nonzero) digits is 355622400, while the sum is 68.

The spelling of 6450716665778 in words is "six trillion, four hundred fifty billion, seven hundred sixteen million, six hundred sixty-five thousand, seven hundred seventy-eight".