66578542 has 8 divisors (see below), whose sum is σ = 100085832. Its totient is φ = 33216600.

The previous prime is 66578521. The next prime is 66578563. The reversal of 66578542 is 24587566.

It is an interprime number because it is at equal distance from previous prime (66578521) and next prime (66578563).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35184 + ... + 37027.

It is an arithmetic number, because the mean of its divisors is an integer number (12510729).

Almost surely, 2^66578542 is an apocalyptic number.

66578542 is a deficient number, since it is larger than the sum of its proper divisors (33507290).

66578542 is a wasteful number, since it uses less digits than its factorization.

66578542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72674.

The product of its digits is 403200, while the sum is 43.

The square root of 66578542 is about 8159.5675130487. The cubic root of 66578542 is about 405.3013902490.

The spelling of 66578542 in words is "sixty-six million, five hundred seventy-eight thousand, five hundred forty-two".