66100427 has 4 divisors (see below), whose sum is σ = 66718296. Its totient is φ = 65482560.

The previous prime is 66100351. The next prime is 66100429. The reversal of 66100427 is 72400166.

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 66100427 - 2¹⁰ = 66099403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66100396 and 66100405.

It is not an unprimeable number, because it can be changed into a prime (66100429) 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, 308774 + ... + 308987.

It is an arithmetic number, because the mean of its divisors is an integer number (16679574).

Almost surely, 2^66100427 is an apocalyptic number.

66100427 is a deficient number, since it is larger than the sum of its proper divisors (617869).

66100427 is a wasteful number, since it uses less digits than its factorization.

66100427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617868.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 66100427 is about 8130.2169097755. The cubic root of 66100427 is about 404.3288727368.

The spelling of 66100427 in words is "sixty-six million, one hundred thousand, four hundred twenty-seven".