166556746 has 4 divisors (see below), whose sum is σ = 249835122. Its totient is φ = 83278372.

The previous prime is 166556737. The next prime is 166556749. The reversal of 166556746 is 647655661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 161010721 + 5546025 = 12689^2 + 2355^2 .

It is a super-2 number, since 2×166556746² = 55482299276217032, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166556696 and 166556705.

It is not an unprimeable number, because it can be changed into a prime (166556749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41639185 + ... + 41639188.

Almost surely, 2^166556746 is an apocalyptic number.

166556746 is a deficient number, since it is larger than the sum of its proper divisors (83278376).

166556746 is an equidigital number, since it uses as much as digits as its factorization.

166556746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83278375.

The product of its digits is 907200, while the sum is 46.

The square root of 166556746 is about 12905.6865760796. The cubic root of 166556746 is about 550.2001981941.

The spelling of 166556746 in words is "one hundred sixty-six million, five hundred fifty-six thousand, seven hundred forty-six".