66767939 has 12 divisors (see below), whose sum is σ = 78609384. Its totient is φ = 56536704.

The previous prime is 66767933. The next prime is 66767941. The reversal of 66767939 is 93976766.

It is not a de Polignac number, because 66767939 - 2¹² = 66763843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66767933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4142 + ... + 12275.

It is an arithmetic number, because the mean of its divisors is an integer number (6550782).

Almost surely, 2^66767939 is an apocalyptic number.

66767939 is a deficient number, since it is larger than the sum of its proper divisors (11841445).

66767939 is a wasteful number, since it uses less digits than its factorization.

66767939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16514 (or 16507 counting only the distinct ones).

The product of its digits is 2571912, while the sum is 53.

The square root of 66767939 is about 8171.1650944036. The cubic root of 66767939 is about 405.6853487559.

The spelling of 66767939 in words is "sixty-six million, seven hundred sixty-seven thousand, nine hundred thirty-nine".