401866038181 has 4 divisors (see below), whose sum is σ = 401901046272. Its totient is φ = 401831030092.

The previous prime is 401866038137. The next prime is 401866038221. The reversal of 401866038181 is 181830668104.

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 401866038181 - 2³⁷ = 264427084709 is a prime.

It is a super-2 number, since 2×401866038181² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401866036181) 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, 17486821 + ... + 17509786.

It is an arithmetic number, because the mean of its divisors is an integer number (100475261568).

Almost surely, 2^401866038181 is an apocalyptic number.

It is an amenable number.

401866038181 is a deficient number, since it is larger than the sum of its proper divisors (35008091).

401866038181 is a wasteful number, since it uses less digits than its factorization.

401866038181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35008090.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 401866038181 in words is "four hundred one billion, eight hundred sixty-six million, thirty-eight thousand, one hundred eighty-one".