66968397 has 8 divisors (see below), whose sum is σ = 99212480. Its totient is φ = 44645580.

The previous prime is 66968381. The next prime is 66968399. The reversal of 66968397 is 79386966.

It is a happy number.

It is not a de Polignac number, because 66968397 - 2⁴ = 66968381 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 (66968399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1240129 + ... + 1240182.

It is an arithmetic number, because the mean of its divisors is an integer number (12401560).

Almost surely, 2^66968397 is an apocalyptic number.

It is an amenable number.

66968397 is a deficient number, since it is larger than the sum of its proper divisors (32244083).

66968397 is a wasteful number, since it uses less digits than its factorization.

66968397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480320 (or 2480314 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 66968397 is about 8183.4220837007. The cubic root of 66968397 is about 406.0909407454.

The spelling of 66968397 in words is "sixty-six million, nine hundred sixty-eight thousand, three hundred ninety-seven".