66861113 has 4 divisors (see below), whose sum is σ = 72939408. Its totient is φ = 60782820.

The previous prime is 66861107. The next prime is 66861121. The reversal of 66861113 is 31116866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66861113 - 2⁶ = 66861049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66861113.

It is not an unprimeable number, because it can be changed into a prime (66861103) 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, 3039131 + ... + 3039152.

It is an arithmetic number, because the mean of its divisors is an integer number (18234852).

Almost surely, 2^66861113 is an apocalyptic number.

It is an amenable number.

66861113 is a deficient number, since it is larger than the sum of its proper divisors (6078295).

66861113 is a wasteful number, since it uses less digits than its factorization.

66861113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6078294.

The product of its digits is 5184, while the sum is 32.

The square root of 66861113 is about 8176.8644968594. The cubic root of 66861113 is about 405.8739710098.

Adding to 66861113 its reverse (31116866), we get a palindrome (97977979).

The spelling of 66861113 in words is "sixty-six million, eight hundred sixty-one thousand, one hundred thirteen".