66078493 has 12 divisors (see below), whose sum is σ = 72573408. Its totient is φ = 60125520.

The previous prime is 66078491. The next prime is 66078497. The reversal of 66078493 is 39487066.

It is a happy number.

It is not a de Polignac number, because 66078493 - 2¹ = 66078491 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 (66078491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9246 + ... + 14752.

It is an arithmetic number, because the mean of its divisors is an integer number (6047784).

Almost surely, 2^66078493 is an apocalyptic number.

It is an amenable number.

66078493 is a deficient number, since it is larger than the sum of its proper divisors (6494915).

66078493 is a wasteful number, since it uses less digits than its factorization.

66078493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5604 (or 5591 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 66078493 is about 8128.8678793544. The cubic root of 66078493 is about 404.2841451860.

The spelling of 66078493 in words is "sixty-six million, seventy-eight thousand, four hundred ninety-three".