66832553 has 4 divisors (see below), whose sum is σ = 66977988. Its totient is φ = 66687120.

The previous prime is 66832511. The next prime is 66832613. The reversal of 66832553 is 35523866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10837264 + 55995289 = 3292^2 + 7483^2 .

It is a cyclic number.

It is not a de Polignac number, because 66832553 - 2⁶ = 66832489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66852553) 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, 72026 + ... + 72947.

It is an arithmetic number, because the mean of its divisors is an integer number (16744497).

Almost surely, 2^66832553 is an apocalyptic number.

It is an amenable number.

66832553 is a deficient number, since it is larger than the sum of its proper divisors (145435).

66832553 is a wasteful number, since it uses less digits than its factorization.

66832553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145434.

The product of its digits is 129600, while the sum is 38.

The square root of 66832553 is about 8175.1179196388. The cubic root of 66832553 is about 405.8161725329.

The spelling of 66832553 in words is "sixty-six million, eight hundred thirty-two thousand, five hundred fifty-three".