66229557 has 4 divisors (see below), whose sum is σ = 88306080. Its totient is φ = 44153036.

The previous prime is 66229549. The next prime is 66229577. The reversal of 66229557 is 75592266.

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.

It is a cyclic number.

It is not a de Polignac number, because 66229557 - 2³ = 66229549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66229577) 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, 11038257 + ... + 11038262.

It is an arithmetic number, because the mean of its divisors is an integer number (22076520).

Almost surely, 2^66229557 is an apocalyptic number.

It is an amenable number.

66229557 is a deficient number, since it is larger than the sum of its proper divisors (22076523).

66229557 is a wasteful number, since it uses less digits than its factorization.

66229557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22076522.

The product of its digits is 226800, while the sum is 42.

The square root of 66229557 is about 8138.1543976506. The cubic root of 66229557 is about 404.5919926981.

The spelling of 66229557 in words is "sixty-six million, two hundred twenty-nine thousand, five hundred fifty-seven".