41605256621 has 4 divisors (see below), whose sum is σ = 41802438144. Its totient is φ = 41408075100.

The previous prime is 41605256611. The next prime is 41605256647. The reversal of 41605256621 is 12665250614.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 41605256621 - 2¹⁰ = 41605255597 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 (41605256611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98590445 + ... + 98590866.

It is an arithmetic number, because the mean of its divisors is an integer number (10450609536).

Almost surely, 2^41605256621 is an apocalyptic number.

It is an amenable number.

41605256621 is a deficient number, since it is larger than the sum of its proper divisors (197181523).

41605256621 is a wasteful number, since it uses less digits than its factorization.

41605256621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197181522.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 41605256621 in words is "forty-one billion, six hundred five million, two hundred fifty-six thousand, six hundred twenty-one".