9977666 has 4 divisors (see below), whose sum is σ = 14966502. Its totient is φ = 4988832.

The previous prime is 9977659. The next prime is 9977683. The reversal of 9977666 is 6667799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6667799 = 1153 ⋅5783.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 3500641 = 2545^2 + 1871^2 .

It is a Curzon number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494415 + ... + 2494418.

Almost surely, 2^9977666 is an apocalyptic number.

9977666 is a deficient number, since it is larger than the sum of its proper divisors (4988836).

9977666 is a wasteful number, since it uses less digits than its factorization.

9977666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988835.

The product of its digits is 857304, while the sum is 50.

The square root of 9977666 is about 3158.7443707904. The cubic root of 9977666 is about 215.2829589682.

The spelling of 9977666 in words is "nine million, nine hundred seventy-seven thousand, six hundred sixty-six".