166631120224661 has 8 divisors (see below), whose sum is σ = 169363133255448. Its totient is φ = 163899118656000.

The previous prime is 166631120224627. The next prime is 166631120224663. The reversal of 166631120224661 is 166422021136661.

166631120224661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 65265086699761 + 101366033524900 = 8078681^2 + 10068070^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166631120224661 - 2¹⁰ = 166631120223637 is a prime.

It is a super-2 number, since 2×166631120224661² (a number of 29 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 (166631120224663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29402381 + ... + 34608701.

It is an arithmetic number, because the mean of its divisors is an integer number (21170391656931).

Almost surely, 2^{166631120224661} is an apocalyptic number.

It is an amenable number.

166631120224661 is a deficient number, since it is larger than the sum of its proper divisors (2732013030787).

166631120224661 is an equidigital number, since it uses as much as digits as its factorization.

166631120224661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731063.

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 166631120224661 in words is "one hundred sixty-six trillion, six hundred thirty-one billion, one hundred twenty million, two hundred twenty-four thousand, six hundred sixty-one".