66277997 has 8 divisors (see below), whose sum is σ = 66992376. Its totient is φ = 65567232.

The previous prime is 66277979. The next prime is 66277999. The reversal of 66277997 is 79977266.

It can be written as a sum of positive squares in 4 ways, for example, as 35652841 + 30625156 = 5971^2 + 5534^2 .

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 66277997 - 2⁶ = 66277933 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 (66277999) 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, 50453 + ... + 51749.

It is an arithmetic number, because the mean of its divisors is an integer number (8374047).

Almost surely, 2^66277997 is an apocalyptic number.

It is an amenable number.

66277997 is a deficient number, since it is larger than the sum of its proper divisors (714379).

66277997 is a wasteful number, since it uses less digits than its factorization.

66277997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807.

The product of its digits is 2000376, while the sum is 53.

The square root of 66277997 is about 8141.1299584271. The cubic root of 66277997 is about 404.6906075809.

The spelling of 66277997 in words is "sixty-six million, two hundred seventy-seven thousand, nine hundred ninety-seven".