41687199581 has 4 divisors (see below), whose sum is σ = 41711423964. Its totient is φ = 41662975200.

The previous prime is 41687199559. The next prime is 41687199599. The reversal of 41687199581 is 18599178614.

41687199581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18599178614 = 2 ⋅9299589307.

It can be written as a sum of positive squares in 2 ways, for example, as 13753425625 + 27933773956 = 117275^2 + 167134^2 .

It is a cyclic number.

It is not a de Polignac number, because 41687199581 - 2³⁰ = 40613457757 is a prime.

It is a super-2 number, since 2×41687199581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 41687199581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41687199181) 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, 12109610 + ... + 12113051.

It is an arithmetic number, because the mean of its divisors is an integer number (10427855991).

Almost surely, 2^41687199581 is an apocalyptic number.

It is an amenable number.

41687199581 is a deficient number, since it is larger than the sum of its proper divisors (24224383).

41687199581 is a wasteful number, since it uses less digits than its factorization.

41687199581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24224382.

The product of its digits is 4354560, while the sum is 59.

The spelling of 41687199581 in words is "forty-one billion, six hundred eighty-seven million, one hundred ninety-nine thousand, five hundred eighty-one".