66717404 has 12 divisors (see below), whose sum is σ = 125736744. Its totient is φ = 30792624.

The previous prime is 66717397. The next prime is 66717433. The reversal of 66717404 is 40471766.

It is a happy number.

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, 641462 + ... + 641565.

It is an arithmetic number, because the mean of its divisors is an integer number (10478062).

Almost surely, 2^66717404 is an apocalyptic number.

It is an amenable number.

66717404 is a deficient number, since it is larger than the sum of its proper divisors (59019340).

66717404 is a wasteful number, since it uses less digits than its factorization.

66717404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283044 (or 1283042 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 66717404 is about 8168.0722327854. The cubic root of 66717404 is about 405.5829718572.

The spelling of 66717404 in words is "sixty-six million, seven hundred seventeen thousand, four hundred four".