66940797 has 32 divisors (see below), whose sum is σ = 111919104. Its totient is φ = 34574400.

The previous prime is 66940789. The next prime is 66940799. The reversal of 66940797 is 79704966.

It is not a de Polignac number, because 66940797 - 2³ = 66940789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66940799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44772 + ... + 46242.

It is an arithmetic number, because the mean of its divisors is an integer number (3497472).

Almost surely, 2^66940797 is an apocalyptic number.

It is an amenable number.

66940797 is a deficient number, since it is larger than the sum of its proper divisors (44978307).

66940797 is a wasteful number, since it uses less digits than its factorization.

66940797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689.

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 66940797 is about 8181.7355738254. The cubic root of 66940797 is about 406.0351450240.

The spelling of 66940797 in words is "sixty-six million, nine hundred forty thousand, seven hundred ninety-seven".