66615343 has 4 divisors (see below), whose sum is σ = 67363920. Its totient is φ = 65866768.

The previous prime is 66615319. The next prime is 66615359. The reversal of 66615343 is 34351666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34351666 = 2 ⋅17175833.

It is a cyclic number.

It is not a de Polignac number, because 66615343 - 2²¹ = 64518191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66615299 and 66615308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66615313) 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, 374155 + ... + 374332.

It is an arithmetic number, because the mean of its divisors is an integer number (16840980).

Almost surely, 2^66615343 is an apocalyptic number.

66615343 is a deficient number, since it is larger than the sum of its proper divisors (748577).

66615343 is an equidigital number, since it uses as much as digits as its factorization.

66615343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748576.

The product of its digits is 38880, while the sum is 34.

The square root of 66615343 is about 8161.8222842696. The cubic root of 66615343 is about 405.3760526888.

The spelling of 66615343 in words is "sixty-six million, six hundred fifteen thousand, three hundred forty-three".