166451493 has 48 divisors (see below), whose sum is σ = 257607168. Its totient is φ = 94867200.

The previous prime is 166451479. The next prime is 166451497. The reversal of 166451493 is 394154661.

It is not a de Polignac number, because 166451493 - 2¹³ = 166443301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166451497) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2728683 + ... + 2728743.

It is an arithmetic number, because the mean of its divisors is an integer number (5366816).

Almost surely, 2^166451493 is an apocalyptic number.

166451493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

166451493 is a deficient number, since it is larger than the sum of its proper divisors (91155675).

166451493 is a wasteful number, since it uses less digits than its factorization.

166451493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 145 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 166451493 is about 12901.6081555750. The cubic root of 166451493 is about 550.0842768927.

The spelling of 166451493 in words is "one hundred sixty-six million, four hundred fifty-one thousand, four hundred ninety-three".