66663500 has 24 divisors (see below), whose sum is σ = 145594176. Its totient is φ = 26665200.

The previous prime is 66663497. The next prime is 66663517. The reversal of 66663500 is 536666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66164 + ... + 67163.

It is an arithmetic number, because the mean of its divisors is an integer number (6066424).

Almost surely, 2^66663500 is an apocalyptic number.

It is an amenable number.

66663500 is an abundant number, since it is smaller than the sum of its proper divisors (78930676).

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

66663500 is a wasteful number, since it uses less digits than its factorization.

66663500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133346 (or 133334 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 66663500 is about 8164.7718890365. The cubic root of 66663500 is about 405.4737128345.

The spelling of 66663500 in words is "sixty-six million, six hundred sixty-three thousand, five hundred".