643346913996 has 36 divisors (see below), whose sum is σ = 1627720573752. Its totient is φ = 214253471424.

The previous prime is 643346913991. The next prime is 643346914033. The reversal of 643346913996 is 699319643346.

643346913996 is a `hidden beast` number, since 6 + 4 + 33 + 469 + 139 + 9 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (643346913991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8105790 + ... + 8184773.

It is an arithmetic number, because the mean of its divisors is an integer number (45214460382).

Almost surely, 2^643346913996 is an apocalyptic number.

It is an amenable number.

643346913996 is an abundant number, since it is smaller than the sum of its proper divisors (984373659756).

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

643346913996 is a wasteful number, since it uses less digits than its factorization.

643346913996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16291670 (or 16291665 counting only the distinct ones).

The product of its digits is 68024448, while the sum is 63.

The spelling of 643346913996 in words is "six hundred forty-three billion, three hundred forty-six million, nine hundred thirteen thousand, nine hundred ninety-six".