66081278 has 16 divisors (see below), whose sum is σ = 110477520. Its totient is φ = 29460096.

The previous prime is 66081263. The next prime is 66081283. The reversal of 66081278 is 87218066.

It is a super-2 number, since 2×66081278² = 8733470604226568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50501 + ... + 51792.

It is an arithmetic number, because the mean of its divisors is an integer number (6904845).

Almost surely, 2^66081278 is an apocalyptic number.

66081278 is a deficient number, since it is larger than the sum of its proper divisors (44396242).

66081278 is a wasteful number, since it uses less digits than its factorization.

66081278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102331.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 66081278 is about 8129.0391806166. The cubic root of 66081278 is about 404.2898248732.

The spelling of 66081278 in words is "sixty-six million, eighty-one thousand, two hundred seventy-eight".