20641852621591 has 8 divisors (see below), whose sum is σ = 20674945461600. Its totient is φ = 20608760985120.

The previous prime is 20641852621573. The next prime is 20641852621603. The reversal of 20641852621591 is 19512625814602.

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

It is a cyclic number.

It is not a de Polignac number, because 20641852621591 - 2⁷ = 20641852621463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641852621541) 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 7 ways as a sum of consecutive naturals, for example, 37910865 + ... + 38451493.

It is an arithmetic number, because the mean of its divisors is an integer number (2584368182700).

Almost surely, 2^{20641852621591} is an apocalyptic number.

20641852621591 is a deficient number, since it is larger than the sum of its proper divisors (33092840009).

20641852621591 is an equidigital number, since it uses as much as digits as its factorization.

20641852621591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601769.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 20641852621591 in words is "twenty trillion, six hundred forty-one billion, eight hundred fifty-two million, six hundred twenty-one thousand, five hundred ninety-one".