166036553 has 4 divisors (see below), whose sum is σ = 168375168. Its totient is φ = 163697940.

The previous prime is 166036547. The next prime is 166036579. The reversal of 166036553 is 355630661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355630661 = 1361 ⋅261301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166036553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166036523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1169201 + ... + 1169342.

It is an arithmetic number, because the mean of its divisors is an integer number (42093792).

Almost surely, 2^166036553 is an apocalyptic number.

It is an amenable number.

166036553 is a deficient number, since it is larger than the sum of its proper divisors (2338615).

166036553 is an equidigital number, since it uses as much as digits as its factorization.

166036553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338614.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 166036553 is about 12885.5171801523. The cubic root of 166036553 is about 549.6268024749.

The spelling of 166036553 in words is "one hundred sixty-six million, thirty-six thousand, five hundred fifty-three".