166661570 has 16 divisors (see below), whose sum is σ = 300222720. Its totient is φ = 66613104.

The previous prime is 166661563. The next prime is 166661581. The reversal of 166661570 is 75166661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8879 + ... + 20301.

It is an arithmetic number, because the mean of its divisors is an integer number (18763920).

Almost surely, 2^166661570 is an apocalyptic number.

166661570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166661570 is a deficient number, since it is larger than the sum of its proper divisors (133561150).

166661570 is a wasteful number, since it uses less digits than its factorization.

166661570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12889.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 166661570 is about 12909.7470927978. The cubic root of 166661570 is about 550.3155984844.

It can be divided in two parts, 1666 and 61570, that added together give a palindrome (63236).

The spelling of 166661570 in words is "one hundred sixty-six million, six hundred sixty-one thousand, five hundred seventy".