66356427 has 4 divisors (see below), whose sum is σ = 88475240. Its totient is φ = 44237616.

The previous prime is 66356419. The next prime is 66356443. The reversal of 66356427 is 72465366.

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

It is not a de Polignac number, because 66356427 - 2³ = 66356419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66354427) 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, 11059402 + ... + 11059407.

It is an arithmetic number, because the mean of its divisors is an integer number (22118810).

Almost surely, 2^66356427 is an apocalyptic number.

66356427 is a deficient number, since it is larger than the sum of its proper divisors (22118813).

66356427 is a wasteful number, since it uses less digits than its factorization.

66356427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22118812.

The product of its digits is 181440, while the sum is 39.

The square root of 66356427 is about 8145.9454331588. The cubic root of 66356427 is about 404.8501747285.

The spelling of 66356427 in words is "sixty-six million, three hundred fifty-six thousand, four hundred twenty-seven".