66776023761 has 32 divisors (see below), whose sum is σ = 94125680640. Its totient is φ = 42040412736.

The previous prime is 66776023759. The next prime is 66776023789. The reversal of 66776023761 is 16732067766.

It is not a de Polignac number, because 66776023761 - 2¹ = 66776023759 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66776023361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7629790 + ... + 7638536.

It is an arithmetic number, because the mean of its divisors is an integer number (2941427520).

Almost surely, 2^66776023761 is an apocalyptic number.

It is an amenable number.

66776023761 is a deficient number, since it is larger than the sum of its proper divisors (27349656879).

66776023761 is a wasteful number, since it uses less digits than its factorization.

66776023761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10693.

The product of its (nonzero) digits is 2667168, while the sum is 51.

The spelling of 66776023761 in words is "sixty-six billion, seven hundred seventy-six million, twenty-three thousand, seven hundred sixty-one".