66666272077 has 4 divisors (see below), whose sum is σ = 66667317696. Its totient is φ = 66665226460.

The previous prime is 66666272063. The next prime is 66666272081. The reversal of 66666272077 is 77027266666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66666272077 - 2³⁵ = 32306533709 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 (66666272027) 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, 420499 + ... + 556912.

It is an arithmetic number, because the mean of its divisors is an integer number (16666829424).

Almost surely, 2^66666272077 is an apocalyptic number.

It is an amenable number.

66666272077 is a deficient number, since it is larger than the sum of its proper divisors (1045619).

66666272077 is an equidigital number, since it uses as much as digits as its factorization.

66666272077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045618.

The product of its (nonzero) digits is 10668672, while the sum is 55.

The spelling of 66666272077 in words is "sixty-six billion, six hundred sixty-six million, two hundred seventy-two thousand, seventy-seven".