641682376644 has 24 divisors (see below), whose sum is σ = 1504782798400. Its totient is φ = 212819279904.

The previous prime is 641682376633. The next prime is 641682376651. The reversal of 641682376644 is 446673286146.

It is a happy number.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

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, 134353219 + ... + 134357994.

Almost surely, 2^641682376644 is an apocalyptic number.

It is an amenable number.

641682376644 is an abundant number, since it is smaller than the sum of its proper divisors (863100421756).

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

641682376644 is a wasteful number, since it uses less digits than its factorization.

641682376644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268711419 (or 268711417 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 57.

The spelling of 641682376644 in words is "six hundred forty-one billion, six hundred eighty-two million, three hundred seventy-six thousand, six hundred forty-four".