66163513 has 4 divisors (see below), whose sum is σ = 71253028. Its totient is φ = 61074000.

The previous prime is 66163501. The next prime is 66163549. The reversal of 66163513 is 31536166.

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 41641209 + 24522304 = 6453^2 + 4952^2 .

It is not a de Polignac number, because 66163513 - 2⁹ = 66163001 is a prime.

It is a super-2 number, since 2×66163513² = 8755220905002338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66163553) 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, 2544738 + ... + 2544763.

It is an arithmetic number, because the mean of its divisors is an integer number (17813257).

Almost surely, 2^66163513 is an apocalyptic number.

It is an amenable number.

66163513 is a deficient number, since it is larger than the sum of its proper divisors (5089515).

66163513 is a wasteful number, since it uses less digits than its factorization.

66163513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5089514.

The product of its digits is 9720, while the sum is 31.

The square root of 66163513 is about 8134.0957088050. The cubic root of 66163513 is about 404.4574618245.

Adding to 66163513 its reverse (31536166), we get a palindrome (97699679).

The spelling of 66163513 in words is "sixty-six million, one hundred sixty-three thousand, five hundred thirteen".