166499421 has 8 divisors (see below), whose sum is σ = 242181024. Its totient is φ = 100908720.

The previous prime is 166499407. The next prime is 166499423. The reversal of 166499421 is 124994661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166499421 - 2¹³ = 166491229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166499423) 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, 2522686 + ... + 2522751.

It is an arithmetic number, because the mean of its divisors is an integer number (30272628).

Almost surely, 2^166499421 is an apocalyptic number.

166499421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166499421 is a deficient number, since it is larger than the sum of its proper divisors (75681603).

166499421 is a wasteful number, since it uses less digits than its factorization.

166499421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5045451.

The product of its digits is 93312, while the sum is 42.

The square root of 166499421 is about 12903.4654647502. The cubic root of 166499421 is about 550.1370688677.

The spelling of 166499421 in words is "one hundred sixty-six million, four hundred ninety-nine thousand, four hundred twenty-one".