66366761 has 4 divisors (see below), whose sum is σ = 68655300. Its totient is φ = 64078224.

The previous prime is 66366757. The next prime is 66366763. The reversal of 66366761 is 16766366.

It is a happy number.

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 33131536 + 33235225 = 5756^2 + 5765^2 .

It is a cyclic number.

It is not a de Polignac number, because 66366761 - 2² = 66366757 is a prime.

It is a super-2 number, since 2×66366761² = 8809093931262242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66366763) 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, 1144226 + ... + 1144283.

It is an arithmetic number, because the mean of its divisors is an integer number (17163825).

Almost surely, 2^66366761 is an apocalyptic number.

It is an amenable number.

66366761 is a deficient number, since it is larger than the sum of its proper divisors (2288539).

66366761 is a wasteful number, since it uses less digits than its factorization.

66366761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288538.

The product of its digits is 163296, while the sum is 41.

The square root of 66366761 is about 8146.5797117563. The cubic root of 66366761 is about 404.8711900480.

The spelling of 66366761 in words is "sixty-six million, three hundred sixty-six thousand, seven hundred sixty-one".