166531403 has 8 divisors (see below), whose sum is σ = 170207856. Its totient is φ = 162885600.

The previous prime is 166531307. The next prime is 166531429. The reversal of 166531403 is 304135661.

It is a happy number.

166531403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 166531403 - 2¹² = 166527307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166531103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3500 + ... + 18582.

It is an arithmetic number, because the mean of its divisors is an integer number (21275982).

Almost surely, 2^166531403 is an apocalyptic number.

166531403 is a deficient number, since it is larger than the sum of its proper divisors (3676453).

166531403 is a wasteful number, since it uses less digits than its factorization.

166531403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15325.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 166531403 is about 12904.7046847264. The cubic root of 166531403 is about 550.1722909267.

The spelling of 166531403 in words is "one hundred sixty-six million, five hundred thirty-one thousand, four hundred three".