66102389 has 4 divisors (see below), whose sum is σ = 66128556. Its totient is φ = 66076224.

The previous prime is 66102371. The next prime is 66102403. The reversal of 66102389 is 98320166.

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 11785489 + 54316900 = 3433^2 + 7370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66102389 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 (66102689) 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, 8834 + ... + 14499.

It is an arithmetic number, because the mean of its divisors is an integer number (16532139).

Almost surely, 2^66102389 is an apocalyptic number.

It is an amenable number.

66102389 is a deficient number, since it is larger than the sum of its proper divisors (26167).

66102389 is a wasteful number, since it uses less digits than its factorization.

66102389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26166.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 66102389 is about 8130.3375698676. The cubic root of 66102389 is about 404.3328731416.

The spelling of 66102389 in words is "sixty-six million, one hundred two thousand, three hundred eighty-nine".