641852396890 has 8 divisors (see below), whose sum is σ = 1155334314420. Its totient is φ = 256740958752.

The previous prime is 641852396863. The next prime is 641852396897. The reversal of 641852396890 is 98693258146.

It can be written as a sum of positive squares in 2 ways, for example, as 636527921929 + 5324474961 = 797827^2 + 72969^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (641852396897) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 32092619835 + ... + 32092619854.

Almost surely, 2^641852396890 is an apocalyptic number.

641852396890 is a deficient number, since it is larger than the sum of its proper divisors (513481917530).

641852396890 is a wasteful number, since it uses less digits than its factorization.

641852396890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64185239696.

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 641852396890 in words is "six hundred forty-one billion, eight hundred fifty-two million, three hundred ninety-six thousand, eight hundred ninety".