166978476 has 144 divisors (see below), whose sum is σ = 509443200. Its totient is φ = 47156256.

The previous prime is 166978463. The next prime is 166978499. The reversal of 166978476 is 674879661.

It is a happy number.

166978476 is a `hidden beast` number, since 166 + 9 + 7 + 8 + 476 = 666.

It is a super-2 number, since 2×166978476² = 55763622894565152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (3048192) is a multiple of the sum of its prime divisors (378).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 735475 + ... + 735701.

It is an arithmetic number, because the mean of its divisors is an integer number (3537800).

Almost surely, 2^166978476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166978476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254721600).

166978476 is an abundant number, since it is smaller than the sum of its proper divisors (342464724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166978476 is a wasteful number, since it uses less digits than its factorization.

166978476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 378 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 166978476 is about 12922.0151679218. The cubic root of 166978476 is about 550.6641849293.

The spelling of 166978476 in words is "one hundred sixty-six million, nine hundred seventy-eight thousand, four hundred seventy-six".