66903894 has 20 divisors (see below), whose sum is σ = 149914644. Its totient is φ = 22301244.

The previous prime is 66903871. The next prime is 66903911. The reversal of 66903894 is 49830966.

It is a super-2 number, since 2×66903894² = 8952262064726472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 206332 + ... + 206655.

Almost surely, 2^66903894 is an apocalyptic number.

66903894 is an abundant number, since it is smaller than the sum of its proper divisors (83010750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66903894 is a wasteful number, since it uses less digits than its factorization.

66903894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413001 (or 412992 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 66903894 is about 8179.4800568251. The cubic root of 66903894 is about 405.9605185385.

The spelling of 66903894 in words is "sixty-six million, nine hundred three thousand, eight hundred ninety-four".