65697966 has 24 divisors (see below), whose sum is σ = 147618744. Its totient is φ = 21899160.

The previous prime is 65697923. The next prime is 65697971. The reversal of 65697966 is 66979656.

65697966 is a `hidden beast` number, since 6 + 569 + 79 + 6 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67105 + ... + 68076.

It is an arithmetic number, because the mean of its divisors is an integer number (6150781).

Almost surely, 2^65697966 is an apocalyptic number.

65697966 is an abundant number, since it is smaller than the sum of its proper divisors (81920778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65697966 is a wasteful number, since it uses less digits than its factorization.

65697966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135198 (or 135186 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 65697966 is about 8105.4281811635. The cubic root of 65697966 is about 403.5065987506.

It can be divided in two parts, 6569 and 7966, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 65697966 in words is "sixty-five million, six hundred ninety-seven thousand, nine hundred sixty-six".