66663536 has 20 divisors (see below), whose sum is σ = 129313152. Its totient is φ = 33292416.

The previous prime is 66663517. The next prime is 66663563. The reversal of 66663536 is 63536666.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 66663493 and 66663502.

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, 15476 + ... + 19308.

Almost surely, 2^66663536 is an apocalyptic number.

It is an amenable number.

66663536 is a deficient number, since it is larger than the sum of its proper divisors (62649616).

66663536 is a wasteful number, since it uses less digits than its factorization.

66663536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4928 (or 4922 counting only the distinct ones).

The product of its digits is 349920, while the sum is 41.

The square root of 66663536 is about 8164.7740936293. The cubic root of 66663536 is about 405.4737858232.

The spelling of 66663536 in words is "sixty-six million, six hundred sixty-three thousand, five hundred thirty-six".