166436561260401 has 16 divisors (see below), whose sum is σ = 222675327331200. Its totient is φ = 110577939600128.

The previous prime is 166436561260391. The next prime is 166436561260439. The reversal of 166436561260401 is 104062165634661.

It is a cyclic number.

It is not a de Polignac number, because 166436561260401 - 2¹⁰ = 166436561259377 is a prime.

It is a super-2 number, since 2×166436561260401² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166436561260441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19992696 + ... + 27066233.

It is an arithmetic number, because the mean of its divisors is an integer number (13917207958200).

Almost surely, 2^{166436561260401} is an apocalyptic number.

It is an amenable number.

166436561260401 is a deficient number, since it is larger than the sum of its proper divisors (56238766070799).

166436561260401 is a wasteful number, since it uses less digits than its factorization.

166436561260401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47062968.

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 166436561260401 in words is "one hundred sixty-six trillion, four hundred thirty-six billion, five hundred sixty-one million, two hundred sixty thousand, four hundred one".