166138553 has 8 divisors (see below), whose sum is σ = 190689408. Its totient is φ = 141791904.

The previous prime is 166138549. The next prime is 166138597. The reversal of 166138553 is 355831661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166138553 - 2² = 166138549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166138543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49301 + ... + 52562.

It is an arithmetic number, because the mean of its divisors is an integer number (23836176).

Almost surely, 2^166138553 is an apocalyptic number.

It is an amenable number.

166138553 is a deficient number, since it is larger than the sum of its proper divisors (24550855).

166138553 is a wasteful number, since it uses less digits than its factorization.

166138553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102103.

The product of its digits is 64800, while the sum is 38.

The square root of 166138553 is about 12889.4745044164. The cubic root of 166138553 is about 549.7393288166.

The spelling of 166138553 in words is "one hundred sixty-six million, one hundred thirty-eight thousand, five hundred fifty-three".