66896771 has 4 divisors (see below), whose sum is σ = 67163544. Its totient is φ = 66630000.

The previous prime is 66896743. The next prime is 66896779. The reversal of 66896771 is 17769866.

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 66896771 - 2²² = 62702467 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66896779) 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, 133010 + ... + 133511.

It is an arithmetic number, because the mean of its divisors is an integer number (16790886).

Almost surely, 2^66896771 is an apocalyptic number.

66896771 is a deficient number, since it is larger than the sum of its proper divisors (266773).

66896771 is a wasteful number, since it uses less digits than its factorization.

66896771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266772.

The product of its digits is 762048, while the sum is 50.

The square root of 66896771 is about 8179.0446263607. The cubic root of 66896771 is about 405.9461110094.

The spelling of 66896771 in words is "sixty-six million, eight hundred ninety-six thousand, seven hundred seventy-one".