66395890276 has 9 divisors (see below), whose sum is σ = 116193709849. Its totient is φ = 33197687464.

The previous prime is 66395890243. The next prime is 66395890313. The reversal of 66395890276 is 67209859366.

The square root of 66395890276 is 257674.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 642622500 + 65753267776 = 25350^2 + 256424^2 .

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 450930 + ... + 579766.

Almost surely, 2^66395890276 is an apocalyptic number.

66395890276 is the 257674-th square number.

It is an amenable number.

66395890276 is a deficient number, since it is larger than the sum of its proper divisors (49797819573).

66395890276 is an frugal number, since it uses more digits than its factorization.

66395890276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257678 (or 128839 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 66395890276 in words is "sixty-six billion, three hundred ninety-five million, eight hundred ninety thousand, two hundred seventy-six".