166190553 has 6 divisors (see below), whose sum is σ = 240053034. Its totient is φ = 110793696.

The previous prime is 166190537. The next prime is 166190573. The reversal of 166190553 is 355091661.

166190553 is a `hidden beast` number, since 16 + 6 + 1 + 90 + 553 = 666.

It can be written as a sum of positive squares in only one way, i.e., 158835609 + 7354944 = 12603^2 + 2712^2 .

It is not a de Polignac number, because 166190553 - 2⁴ = 166190537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166190513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9232800 + ... + 9232817.

It is an arithmetic number, because the mean of its divisors is an integer number (40008839).

Almost surely, 2^166190553 is an apocalyptic number.

It is an amenable number.

166190553 is a deficient number, since it is larger than the sum of its proper divisors (73862481).

166190553 is a wasteful number, since it uses less digits than its factorization.

166190553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18465623 (or 18465620 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 166190553 is about 12891.4914963320. The cubic root of 166190553 is about 549.7966774626.

The spelling of 166190553 in words is "one hundred sixty-six million, one hundred ninety thousand, five hundred fifty-three".