66865597097 has 8 divisors (see below), whose sum is σ = 72254873544. Its totient is φ = 61511430528.

The previous prime is 66865597039. The next prime is 66865597177. The reversal of 66865597097 is 79079556866.

It can be written as a sum of positive squares in 4 ways, for example, as 22823957776 + 44041639321 = 151076^2 + 209861^2 .

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 66865597097 - 2¹² = 66865593001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66465597097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8773508 + ... + 8781125.

It is an arithmetic number, because the mean of its divisors is an integer number (9031859193).

Almost surely, 2^66865597097 is an apocalyptic number.

It is an amenable number.

66865597097 is a deficient number, since it is larger than the sum of its proper divisors (5389276447).

66865597097 is a wasteful number, since it uses less digits than its factorization.

66865597097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17554939.

The product of its (nonzero) digits is 171460800, while the sum is 68.

The spelling of 66865597097 in words is "sixty-six billion, eight hundred sixty-five million, five hundred ninety-seven thousand, ninety-seven".