166601000 has 32 divisors (see below), whose sum is σ = 389848680. Its totient is φ = 66640000.

The previous prime is 166600991. The next prime is 166601011. The reversal of 166601000 is 106661.

It can be written as a sum of positive squares in 4 ways, for example, as 51811204 + 114789796 = 7198^2 + 10714^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 82301 + ... + 84300.

Almost surely, 2^166601000 is an apocalyptic number.

166601000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166601000 is an abundant number, since it is smaller than the sum of its proper divisors (223247680).

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

166601000 is a wasteful number, since it uses less digits than its factorization.

166601000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166622 (or 166608 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 166601000 is about 12907.4009777337. The cubic root of 166601000 is about 550.2489231362.

Adding to 166601000 its reverse (106661), we get a palindrome (166707661).

The spelling of 166601000 in words is "one hundred sixty-six million, six hundred one thousand".