66700077 has 4 divisors (see below), whose sum is σ = 88933440. Its totient is φ = 44466716.

The previous prime is 66700057. The next prime is 66700079. The reversal of 66700077 is 77000766.

It is a happy number.

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 66700077 - 2⁷ = 66699949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66700079) 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, 11116677 + ... + 11116682.

It is an arithmetic number, because the mean of its divisors is an integer number (22233360).

Almost surely, 2^66700077 is an apocalyptic number.

It is an amenable number.

66700077 is a deficient number, since it is larger than the sum of its proper divisors (22233363).

66700077 is a wasteful number, since it uses less digits than its factorization.

66700077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22233362.

The product of its (nonzero) digits is 12348, while the sum is 33.

The square root of 66700077 is about 8167.0115097262. The cubic root of 66700077 is about 405.5478578580.

The spelling of 66700077 in words is "sixty-six million, seven hundred thousand, seventy-seven".