66903718 has 24 divisors (see below), whose sum is σ = 119594664. Its totient is φ = 27972000.

The previous prime is 66903709. The next prime is 66903779. The reversal of 66903718 is 81730966.

It is a super-2 number, since 2×66903718² = 8952214964447048, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4308 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (4983111).

Almost surely, 2^66903718 is an apocalyptic number.

66903718 is a deficient number, since it is larger than the sum of its proper divisors (52690946).

66903718 is a wasteful number, since it uses less digits than its factorization.

66903718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16708 (or 16701 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 66903718 is about 8179.4692981880. The cubic root of 66903718 is about 405.9601625597.

The spelling of 66903718 in words is "sixty-six million, nine hundred three thousand, seven hundred eighteen".