66116377 has 4 divisors (see below), whose sum is σ = 66210340. Its totient is φ = 66022416.

The previous prime is 66116363. The next prime is 66116381. The reversal of 66116377 is 77361166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37161216 + 28955161 = 6096^2 + 5381^2 .

It is a cyclic number.

It is not a de Polignac number, because 66116377 - 2¹⁵ = 66083609 is a prime.

It is a super-3 number, since 3×66116377³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66116977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45918 + ... + 47335.

It is an arithmetic number, because the mean of its divisors is an integer number (16552585).

Almost surely, 2^66116377 is an apocalyptic number.

It is an amenable number.

66116377 is a deficient number, since it is larger than the sum of its proper divisors (93963).

66116377 is an equidigital number, since it uses as much as digits as its factorization.

66116377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93962.

The product of its digits is 31752, while the sum is 37.

The square root of 66116377 is about 8131.1977592480. The cubic root of 66116377 is about 404.3613915729.

The spelling of 66116377 in words is "sixty-six million, one hundred sixteen thousand, three hundred seventy-seven".