41523166621 has 4 divisors (see below), whose sum is σ = 43965705852. Its totient is φ = 39080627392.

The previous prime is 41523166609. The next prime is 41523166627. The reversal of 41523166621 is 12666132514.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18276065721 + 23247100900 = 135189^2 + 152470^2 .

It is a cyclic number.

It is not a de Polignac number, because 41523166621 - 2²⁵ = 41489612189 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 (41523166627) 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, 1221269590 + ... + 1221269623.

It is an arithmetic number, because the mean of its divisors is an integer number (10991426463).

Almost surely, 2^41523166621 is an apocalyptic number.

It is an amenable number.

41523166621 is a deficient number, since it is larger than the sum of its proper divisors (2442539231).

41523166621 is a wasteful number, since it uses less digits than its factorization.

41523166621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442539230.

The product of its digits is 51840, while the sum is 37.

The spelling of 41523166621 in words is "forty-one billion, five hundred twenty-three million, one hundred sixty-six thousand, six hundred twenty-one".