66697397 has 8 divisors (see below), whose sum is σ = 71984640. Its totient is φ = 61432560.

The previous prime is 66697387. The next prime is 66697403. The reversal of 66697397 is 79379666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66697397 - 2⁴ = 66697381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66697327) 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 7 ways as a sum of consecutive naturals, for example, 872 + ... + 11582.

It is an arithmetic number, because the mean of its divisors is an integer number (8998080).

Almost surely, 2^66697397 is an apocalyptic number.

It is an amenable number.

66697397 is a deficient number, since it is larger than the sum of its proper divisors (5287243).

66697397 is a wasteful number, since it uses less digits than its factorization.

66697397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11203.

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

The square root of 66697397 is about 8166.8474333735. The cubic root of 66697397 is about 405.5424261660.

The spelling of 66697397 in words is "sixty-six million, six hundred ninety-seven thousand, three hundred ninety-seven".