66912238277 has 4 divisors (see below), whose sum is σ = 66913201356. Its totient is φ = 66911275200.

The previous prime is 66912238259. The next prime is 66912238313. The reversal of 66912238277 is 77283221966.

It is a Cunningham number, because it is equal to 258674²+1.

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 60214288996 + 6697949281 = 245386^2 + 81841^2 .

It is a cyclic number.

It is not a de Polignac number, because 66912238277 - 2²² = 66908043973 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 (66912235277) 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, 368474 + ... + 519227.

It is an arithmetic number, because the mean of its divisors is an integer number (16728300339).

Almost surely, 2^66912238277 is an apocalyptic number.

It is an amenable number.

66912238277 is a deficient number, since it is larger than the sum of its proper divisors (963079).

66912238277 is an equidigital number, since it uses as much as digits as its factorization.

66912238277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963078.

The product of its digits is 3048192, while the sum is 53.

The spelling of 66912238277 in words is "sixty-six billion, nine hundred twelve million, two hundred thirty-eight thousand, two hundred seventy-seven".