65665776 has 40 divisors (see below), whose sum is σ = 185059584. Its totient is φ = 19898560.

The previous prime is 65665771. The next prime is 65665811. The reversal of 65665776 is 67756656.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65665771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61656 + ... + 62711.

Almost surely, 2^65665776 is an apocalyptic number.

65665776 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

65665776 is an abundant number, since it is smaller than the sum of its proper divisors (119393808).

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

65665776 is a wasteful number, since it uses less digits than its factorization.

65665776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124389 (or 124383 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 48.

The square root of 65665776 is about 8103.4422315458. The cubic root of 65665776 is about 403.4406860079.

The spelling of 65665776 in words is "sixty-five million, six hundred sixty-five thousand, seven hundred seventy-six".