66656542 has 8 divisors (see below), whose sum is σ = 100024056. Its totient is φ = 33315192.

The previous prime is 66656533. The next prime is 66656543. The reversal of 66656542 is 24565666.

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

It is a junction number, because it is equal to n+sod(n) for n = 66656495 and 66656504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66656543) 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, 2128 + ... + 11740.

It is an arithmetic number, because the mean of its divisors is an integer number (12503007).

Almost surely, 2^66656542 is an apocalyptic number.

66656542 is a deficient number, since it is larger than the sum of its proper divisors (33367514).

66656542 is a wasteful number, since it uses less digits than its factorization.

66656542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13082.

The product of its digits is 259200, while the sum is 40.

The square root of 66656542 is about 8164.3457790566. The cubic root of 66656542 is about 405.4596052431.

The spelling of 66656542 in words is "sixty-six million, six hundred fifty-six thousand, five hundred forty-two".