65669977 has 4 divisors (see below), whose sum is σ = 66746596. Its totient is φ = 64593360.

The previous prime is 65669971. The next prime is 65669999. The reversal of 65669977 is 77996656.

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 1413721 + 64256256 = 1189^2 + 8016^2 .

It is a cyclic number.

It is not a de Polignac number, because 65669977 - 2³ = 65669969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65669971) 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, 538218 + ... + 538339.

It is an arithmetic number, because the mean of its divisors is an integer number (16686649).

Almost surely, 2^65669977 is an apocalyptic number.

It is an amenable number.

65669977 is a deficient number, since it is larger than the sum of its proper divisors (1076619).

65669977 is a wasteful number, since it uses less digits than its factorization.

65669977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076618.

The product of its digits is 4286520, while the sum is 55.

The square root of 65669977 is about 8103.7014382318. The cubic root of 65669977 is about 403.4492892626.

The spelling of 65669977 in words is "sixty-five million, six hundred sixty-nine thousand, nine hundred seventy-seven".