66883819 has 4 divisors (see below), whose sum is σ = 70404040. Its totient is φ = 63363600.

The previous prime is 66883813. The next prime is 66883829. The reversal of 66883819 is 91838866.

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

It is a cyclic number.

It is not a de Polignac number, because 66883819 - 2⁵ = 66883787 is a prime.

It is a super-2 number, since 2×66883819² = 8946890488049522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66883813) 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, 1760082 + ... + 1760119.

It is an arithmetic number, because the mean of its divisors is an integer number (17601010).

Almost surely, 2^66883819 is an apocalyptic number.

66883819 is a deficient number, since it is larger than the sum of its proper divisors (3520221).

66883819 is a wasteful number, since it uses less digits than its factorization.

66883819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520220.

The product of its digits is 497664, while the sum is 49.

The square root of 66883819 is about 8178.2528085160. The cubic root of 66883819 is about 405.9199106746.

The spelling of 66883819 in words is "sixty-six million, eight hundred eighty-three thousand, eight hundred nineteen".