66278113 has 6 divisors (see below), whose sum is σ = 72851282. Its totient is φ = 60252720.

The previous prime is 66278101. The next prime is 66278117. The reversal of 66278113 is 31187266.

It can be written as a sum of positive squares in only one way, i.e., 36869184 + 29408929 = 6072^2 + 5423^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66278113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66278117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 273756 + ... + 273997.

Almost surely, 2^66278113 is an apocalyptic number.

It is an amenable number.

66278113 is a deficient number, since it is larger than the sum of its proper divisors (6573169).

66278113 is a wasteful number, since it uses less digits than its factorization.

66278113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547775 (or 547764 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 66278113 is about 8141.1370827422. The cubic root of 66278113 is about 404.6908436777.

The spelling of 66278113 in words is "sixty-six million, two hundred seventy-eight thousand, one hundred thirteen".