641742566 has 16 divisors (see below), whose sum is σ = 1001386800. Its totient is φ = 308071008.

The previous prime is 641742547. The next prime is 641742581. The reversal of 641742566 is 665247146.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20525 + ... + 41288.

It is an arithmetic number, because the mean of its divisors is an integer number (62586675).

Almost surely, 2^641742566 is an apocalyptic number.

641742566 is a deficient number, since it is larger than the sum of its proper divisors (359644234).

641742566 is a wasteful number, since it uses less digits than its factorization.

641742566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62023.

The product of its digits is 241920, while the sum is 41.

The square root of 641742566 is about 25332.6383545023. The cubic root of 641742566 is about 862.5553015301. Note that the first 3 decimals are identical.

The spelling of 641742566 in words is "six hundred forty-one million, seven hundred forty-two thousand, five hundred sixty-six".