666224077 has 4 divisors (see below), whose sum is σ = 668394496. Its totient is φ = 664053660.

The previous prime is 666224071. The next prime is 666224089. The reversal of 666224077 is 770422666.

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 a de Polignac number, because none of the positive numbers 2^k-666224077 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 (666224071) 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, 1084749 + ... + 1085362.

It is an arithmetic number, because the mean of its divisors is an integer number (167098624).

Almost surely, 2^666224077 is an apocalyptic number.

It is an amenable number.

666224077 is a deficient number, since it is larger than the sum of its proper divisors (2170419).

666224077 is a wasteful number, since it uses less digits than its factorization.

666224077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170418.

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 666224077 is about 25811.3168397120. The cubic root of 666224077 is about 873.3871030967.

The spelling of 666224077 in words is "six hundred sixty-six million, two hundred twenty-four thousand, seventy-seven".