66956117 has 4 divisors (see below), whose sum is σ = 68513280. Its totient is φ = 65398956.

The previous prime is 66956107. The next prime is 66956129. The reversal of 66956117 is 71165966.

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 66956117 - 2¹² = 66952021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66956107) 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, 778517 + ... + 778602.

It is an arithmetic number, because the mean of its divisors is an integer number (17128320).

Almost surely, 2^66956117 is an apocalyptic number.

It is an amenable number.

66956117 is a deficient number, since it is larger than the sum of its proper divisors (1557163).

66956117 is a wasteful number, since it uses less digits than its factorization.

66956117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557162.

The product of its digits is 68040, while the sum is 41.

The square root of 66956117 is about 8182.6717519402. The cubic root of 66956117 is about 406.0661175859.

The spelling of 66956117 in words is "sixty-six million, nine hundred fifty-six thousand, one hundred seventeen".