166421077 has 4 divisors (see below), whose sum is σ = 173656800. Its totient is φ = 159185356.

The previous prime is 166421039. The next prime is 166421119. The reversal of 166421077 is 770124661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 770124661 = 31 ⋅24842731.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166421077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166421027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3617827 + ... + 3617872.

It is an arithmetic number, because the mean of its divisors is an integer number (43414200).

Almost surely, 2^166421077 is an apocalyptic number.

It is an amenable number.

166421077 is a deficient number, since it is larger than the sum of its proper divisors (7235723).

166421077 is an equidigital number, since it uses as much as digits as its factorization.

166421077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7235722.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 166421077 is about 12900.4293339408. The cubic root of 166421077 is about 550.0507688673.

The spelling of 166421077 in words is "one hundred sixty-six million, four hundred twenty-one thousand, seventy-seven".