166617772 has 6 divisors (see below), whose sum is σ = 291581108. Its totient is φ = 83308884.

The previous prime is 166617767. The next prime is 166617791. The reversal of 166617772 is 277716661.

It is a super-2 number, since 2×166617772² = 55522963892487968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20827218 + ... + 20827225.

Almost surely, 2^166617772 is an apocalyptic number.

It is an amenable number.

166617772 is a deficient number, since it is larger than the sum of its proper divisors (124963336).

166617772 is a wasteful number, since it uses less digits than its factorization.

166617772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41654447 (or 41654445 counting only the distinct ones).

The product of its digits is 148176, while the sum is 43.

The square root of 166617772 is about 12908.0506661540. The cubic root of 166617772 is about 550.2673873416.

The spelling of 166617772 in words is "one hundred sixty-six million, six hundred seventeen thousand, seven hundred seventy-two".