66503404 has 12 divisors (see below), whose sum is σ = 126961128. Its totient is φ = 30228800.

The previous prime is 66503387. The next prime is 66503417. The reversal of 66503404 is 40430566.

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, 755677 + ... + 755764.

It is an arithmetic number, because the mean of its divisors is an integer number (10580094).

Almost surely, 2^66503404 is an apocalyptic number.

It is an amenable number.

66503404 is a deficient number, since it is larger than the sum of its proper divisors (60457724).

66503404 is a wasteful number, since it uses less digits than its factorization.

66503404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511456 (or 1511454 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66503404 is about 8154.9619251104. The cubic root of 66503404 is about 405.1488636322.

The spelling of 66503404 in words is "sixty-six million, five hundred three thousand, four hundred four".