166613553 has 12 divisors (see below), whose sum is σ = 247168948. Its totient is φ = 108073440.

The previous prime is 166613533. The next prime is 166613563. The reversal of 166613553 is 355316661.

166613553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 118004769 + 48608784 = 10863^2 + 6972^2 .

It is not a de Polignac number, because 166613553 - 2²⁰ = 165564977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166613533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249838 + ... + 250503.

Almost surely, 2^166613553 is an apocalyptic number.

It is an amenable number.

166613553 is a deficient number, since it is larger than the sum of its proper divisors (80555395).

166613553 is a wasteful number, since it uses less digits than its factorization.

166613553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500384 (or 500381 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 166613553 is about 12907.8872399785. The cubic root of 166613553 is about 550.2627427836.

The spelling of 166613553 in words is "one hundred sixty-six million, six hundred thirteen thousand, five hundred fifty-three".