641663416213526 has 16 divisors (see below), whose sum is σ = 1103508786996384. Its totient is φ = 274120017148224.

The previous prime is 641663416213489. The next prime is 641663416213531. The reversal of 641663416213526 is 625312614366146.

It is a Curzon number.

It is a congruent number.

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, 73215812165 + ... + 73215820928.

It is an arithmetic number, because the mean of its divisors is an integer number (68969299187274).

Almost surely, 2^{641663416213526} is an apocalyptic number.

641663416213526 is a deficient number, since it is larger than the sum of its proper divisors (461845370782858).

641663416213526 is a wasteful number, since it uses less digits than its factorization.

641663416213526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146431633415.

The product of its digits is 22394880, while the sum is 56.

The spelling of 641663416213526 in words is "six hundred forty-one trillion, six hundred sixty-three billion, four hundred sixteen million, two hundred thirteen thousand, five hundred twenty-six".