66113863 has 4 divisors (see below), whose sum is σ = 69593560. Its totient is φ = 62634168.

The previous prime is 66113809. The next prime is 66113911. The reversal of 66113863 is 36831166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36831166 = 2 ⋅18415583.

It is a cyclic number.

It is not a de Polignac number, because 66113863 - 2⁹ = 66113351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66113363) 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, 1739820 + ... + 1739857.

It is an arithmetic number, because the mean of its divisors is an integer number (17398390).

Almost surely, 2^66113863 is an apocalyptic number.

66113863 is a deficient number, since it is larger than the sum of its proper divisors (3479697).

66113863 is a wasteful number, since it uses less digits than its factorization.

66113863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3479696.

The product of its digits is 15552, while the sum is 34.

The square root of 66113863 is about 8131.0431680074. The cubic root of 66113863 is about 404.3562663807.

The spelling of 66113863 in words is "sixty-six million, one hundred thirteen thousand, eight hundred sixty-three".