66848913 has 18 divisors (see below), whose sum is σ = 102394422. Its totient is φ = 41880960.

The previous prime is 66848909. The next prime is 66848917. The reversal of 66848913 is 31984866.

It is an interprime number because it is at equal distance from previous prime (66848909) and next prime (66848917).

It can be written as a sum of positive squares in 3 ways, for example, as 38044224 + 28804689 = 6168^2 + 5367^2 .

It is not a de Polignac number, because 66848913 - 2² = 66848909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66848917) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 100803 + ... + 101463.

It is an arithmetic number, because the mean of its divisors is an integer number (5688579).

Almost surely, 2^66848913 is an apocalyptic number.

It is an amenable number.

66848913 is a deficient number, since it is larger than the sum of its proper divisors (35545509).

66848913 is an equidigital number, since it uses as much as digits as its factorization.

66848913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 681 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 66848913 is about 8176.1184555998. The cubic root of 66848913 is about 405.8492831984.

The spelling of 66848913 in words is "sixty-six million, eight hundred forty-eight thousand, nine hundred thirteen".