166621022 has 4 divisors (see below), whose sum is σ = 249931536. Its totient is φ = 83310510.

The previous prime is 166621019. The next prime is 166621031. The reversal of 166621022 is 220126661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 220126661 = 1409 ⋅156229.

It is a junction number, because it is equal to n+sod(n) for n = 166620982 and 166621000.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 41655254 + ... + 41655257.

It is an arithmetic number, because the mean of its divisors is an integer number (62482884).

Almost surely, 2^166621022 is an apocalyptic number.

166621022 is a deficient number, since it is larger than the sum of its proper divisors (83310514).

166621022 is an equidigital number, since it uses as much as digits as its factorization.

166621022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83310513.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 166621022 is about 12908.1765559664. The cubic root of 166621022 is about 550.2709651060.

Adding to 166621022 its reverse (220126661), we get a palindrome (386747683).

The spelling of 166621022 in words is "one hundred sixty-six million, six hundred twenty-one thousand, twenty-two".