66612493 has 2 divisors, whose sum is σ = 66612494. Its totient is φ = 66612492.

The previous prime is 66612479. The next prime is 66612503. The reversal of 66612493 is 39421666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60171049 + 6441444 = 7757^2 + 2538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66612493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66612473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33306246 + 33306247.

It is an arithmetic number, because the mean of its divisors is an integer number (33306247).

Almost surely, 2^66612493 is an apocalyptic number.

It is an amenable number.

66612493 is a deficient number, since it is larger than the sum of its proper divisors (1).

66612493 is an equidigital number, since it uses as much as digits as its factorization.

66612493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 66612493 is about 8161.6476890393. The cubic root of 66612493 is about 405.3702715470.

The spelling of 66612493 in words is "sixty-six million, six hundred twelve thousand, four hundred ninety-three".