166421452 has 6 divisors (see below), whose sum is σ = 291237548. Its totient is φ = 83210724.

The previous prime is 166421447. The next prime is 166421471. The reversal of 166421452 is 254124661.

It is a happy number.

It is a super-3 number, since 3×166421452³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20802678 + ... + 20802685.

Almost surely, 2^166421452 is an apocalyptic number.

It is an amenable number.

166421452 is a deficient number, since it is larger than the sum of its proper divisors (124816096).

166421452 is a wasteful number, since it uses less digits than its factorization.

166421452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41605367 (or 41605365 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 166421452 is about 12900.4438683326. The cubic root of 166421452 is about 550.0511820138.

The spelling of 166421452 in words is "one hundred sixty-six million, four hundred twenty-one thousand, four hundred fifty-two".