641666667366 has 24 divisors (see below), whose sum is σ = 1391774347080. Its totient is φ = 213658647936.

The previous prime is 641666667353. The next prime is 641666667371. The reversal of 641666667366 is 663766666146.

It is a super-2 number, since 2×641666667366² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19169580 + ... + 19203023.

It is an arithmetic number, because the mean of its divisors is an integer number (57990597795).

Almost surely, 2^641666667366 is an apocalyptic number.

641666667366 is an abundant number, since it is smaller than the sum of its proper divisors (750107679714).

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

641666667366 is a wasteful number, since it uses less digits than its factorization.

641666667366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38373540 (or 38373537 counting only the distinct ones).

The product of its digits is 141087744, while the sum is 63.

The spelling of 641666667366 in words is "six hundred forty-one billion, six hundred sixty-six million, six hundred sixty-seven thousand, three hundred sixty-six".