641725853 has 2 divisors, whose sum is σ = 641725854. Its totient is φ = 641725852.

The previous prime is 641725849. The next prime is 641725879. The reversal of 641725853 is 358527146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 371024644 + 270701209 = 19262^2 + 16453^2 .

It is a cyclic number.

It is not a de Polignac number, because 641725853 - 2² = 641725849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 641725853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641721853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320862926 + 320862927.

It is an arithmetic number, because the mean of its divisors is an integer number (320862927).

Almost surely, 2^641725853 is an apocalyptic number.

It is an amenable number.

641725853 is a deficient number, since it is larger than the sum of its proper divisors (1).

641725853 is an equidigital number, since it uses as much as digits as its factorization.

641725853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 41.

The square root of 641725853 is about 25332.3084814630. The cubic root of 641725853 is about 862.5478135784.

The spelling of 641725853 in words is "six hundred forty-one million, seven hundred twenty-five thousand, eight hundred fifty-three".