66081776 has 10 divisors (see below), whose sum is σ = 128033472. Its totient is φ = 33040880.

The previous prime is 66081773. The next prime is 66081779. The reversal of 66081776 is 67718066.

It is an interprime number because it is at equal distance from previous prime (66081773) and next prime (66081779).

It is a super-2 number, since 2×66081776² = 8733602238628352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66081773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2065040 + ... + 2065071.

Almost surely, 2^66081776 is an apocalyptic number.

It is an amenable number.

66081776 is a deficient number, since it is larger than the sum of its proper divisors (61951696).

66081776 is a wasteful number, since it uses less digits than its factorization.

66081776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130119 (or 4130113 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 66081776 is about 8129.0698114852. The cubic root of 66081776 is about 404.2908404701.

The spelling of 66081776 in words is "sixty-six million, eighty-one thousand, seven hundred seventy-six".