66670538597 has 4 divisors (see below), whose sum is σ = 71799041580. Its totient is φ = 61542035616.

The previous prime is 66670538591. The next prime is 66670538629. The reversal of 66670538597 is 79583507666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8268083041 + 58402455556 = 90929^2 + 241666^2 .

It is a cyclic number.

It is not a de Polignac number, because 66670538597 - 2⁶ = 66670538533 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 (66670538591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2564251472 + ... + 2564251497.

It is an arithmetic number, because the mean of its divisors is an integer number (17949760395).

Almost surely, 2^66670538597 is an apocalyptic number.

It is an amenable number.

66670538597 is a deficient number, since it is larger than the sum of its proper divisors (5128502983).

66670538597 is a wasteful number, since it uses less digits than its factorization.

66670538597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128502982.

The product of its (nonzero) digits is 57153600, while the sum is 62.

The spelling of 66670538597 in words is "sixty-six billion, six hundred seventy million, five hundred thirty-eight thousand, five hundred ninety-seven".