166461399 has 60 divisors (see below), whose sum is σ = 284991784. Its totient is φ = 96235776.

The previous prime is 166461391. The next prime is 166461401. The reversal of 166461399 is 993164661.

It is not a de Polignac number, because 166461399 - 2³ = 166461391 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 (166461391) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 304044 + ... + 304590.

Almost surely, 2^166461399 is an apocalyptic number.

166461399 is a deficient number, since it is larger than the sum of its proper divisors (118530385).

166461399 is a wasteful number, since it uses less digits than its factorization.

166461399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 580 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 166461399 is about 12901.9920554928. The cubic root of 166461399 is about 550.0951890342.

The spelling of 166461399 in words is "one hundred sixty-six million, four hundred sixty-one thousand, three hundred ninety-nine".