66110513 has 4 divisors (see below), whose sum is σ = 75554880. Its totient is φ = 56666148.

The previous prime is 66110509. The next prime is 66110521. The reversal of 66110513 is 31501166.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31501166 = 2 ⋅15750583.

It is not a de Polignac number, because 66110513 - 2² = 66110509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66110543) 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, 4722173 + ... + 4722186.

It is an arithmetic number, because the mean of its divisors is an integer number (18888720).

Almost surely, 2^66110513 is an apocalyptic number.

It is an amenable number.

66110513 is a deficient number, since it is larger than the sum of its proper divisors (9444367).

66110513 is an equidigital number, since it uses as much as digits as its factorization.

66110513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9444366.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 66110513 is about 8130.8371647697. The cubic root of 66110513 is about 404.3494366665.

Adding to 66110513 its reverse (31501166), we get a palindrome (97611679).

The spelling of 66110513 in words is "sixty-six million, one hundred ten thousand, five hundred thirteen".