166122021631 has 8 divisors (see below), whose sum is σ = 166344409728. Its totient is φ = 165899712000.

The previous prime is 166122021629. The next prime is 166122021661. The reversal of 166122021631 is 136120221661.

It is a happy number.

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 166122021631 - 2¹ = 166122021629 is a prime.

It is a super-2 number, since 2×166122021631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166122021593 and 166122021602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166122021661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5085591 + ... + 5118151.

It is an arithmetic number, because the mean of its divisors is an integer number (20793051216).

Almost surely, 2^166122021631 is an apocalyptic number.

166122021631 is a deficient number, since it is larger than the sum of its proper divisors (222388097).

166122021631 is an equidigital number, since it uses as much as digits as its factorization.

166122021631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39233.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 166122021631 in words is "one hundred sixty-six billion, one hundred twenty-two million, twenty-one thousand, six hundred thirty-one".