641766474675 has 36 divisors (see below), whose sum is σ = 1150845455760. Its totient is φ = 341867396160.

The previous prime is 641766474551. The next prime is 641766474773. The reversal of 641766474675 is 576474667146.

It is a happy number.

641766474675 is a `hidden beast` number, since 6 + 41 + 7 + 66 + 474 + 67 + 5 = 666.

It is not a de Polignac number, because 641766474675 - 2¹⁸ = 641766212531 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1511044 + ... + 1888593.

Almost surely, 2^641766474675 is an apocalyptic number.

641766474675 is a deficient number, since it is larger than the sum of its proper divisors (509078981085).

641766474675 is a wasteful number, since it uses less digits than its factorization.

641766474675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400492 (or 3400484 counting only the distinct ones).

The product of its digits is 142248960, while the sum is 63.

The spelling of 641766474675 in words is "six hundred forty-one billion, seven hundred sixty-six million, four hundred seventy-four thousand, six hundred seventy-five".