641621306412 has 18 divisors (see below), whose sum is σ = 1621876080188. Its totient is φ = 213873768792.

The previous prime is 641621306411. The next prime is 641621306419. The reversal of 641621306412 is 214603126146.

641621306412 is a `hidden beast` number, since 6 + 4 + 1 + 6 + 2 + 1 + 3 + 0 + 641 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17822814067 = 641621306412 / (6 + 4 + 1 + 6 + 2 + 1 + 3 + 0 + 6 + 4 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (641621306411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8911406998 + ... + 8911407069.

Almost surely, 2^641621306412 is an apocalyptic number.

It is an amenable number.

641621306412 is an abundant number, since it is smaller than the sum of its proper divisors (980254773776).

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

641621306412 is a wasteful number, since it uses less digits than its factorization.

641621306412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17822814077 (or 17822814072 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 641621306412 in words is "six hundred forty-one billion, six hundred twenty-one million, three hundred six thousand, four hundred twelve".