66896791 has 18 divisors (see below), whose sum is σ = 75442848. Its totient is φ = 59230080.

The previous prime is 66896783. The next prime is 66896821. The reversal of 66896791 is 19769866.

It is not a de Polignac number, because 66896791 - 2³ = 66896783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66896741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 591951 + ... + 592063.

Almost surely, 2^66896791 is an apocalyptic number.

66896791 is a deficient number, since it is larger than the sum of its proper divisors (8546057).

66896791 is a wasteful number, since it uses less digits than its factorization.

66896791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 157 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 66896791 is about 8179.0458489973. The cubic root of 66896791 is about 405.9461514644.

The spelling of 66896791 in words is "sixty-six million, eight hundred ninety-six thousand, seven hundred ninety-one".