401661166099 has 2 divisors, whose sum is σ = 401661166100. Its totient is φ = 401661166098.

The previous prime is 401661166097. The next prime is 401661166111. The reversal of 401661166099 is 990661166104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401661166099 - 2¹ = 401661166097 is a prime.

It is a super-2 number, since 2×401661166099² (a number of 24 digits) contains 22 as substring.

Together with 401661166097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (401661166097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200830583049 + 200830583050.

It is an arithmetic number, because the mean of its divisors is an integer number (200830583050).

Almost surely, 2^401661166099 is an apocalyptic number.

401661166099 is a deficient number, since it is larger than the sum of its proper divisors (1).

401661166099 is an equidigital number, since it uses as much as digits as its factorization.

401661166099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 401661166099 in words is "four hundred one billion, six hundred sixty-one million, one hundred sixty-six thousand, ninety-nine".