66635255406 has 8 divisors (see below), whose sum is σ = 133270510824. Its totient is φ = 22211751800.

The previous prime is 66635255353. The next prime is 66635255443. The reversal of 66635255406 is 60455253666.

It is a sphenic number, since it is the product of 3 distinct primes.

66635255406 is an admirable number.

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, 5552937945 + ... + 5552937956.

It is an arithmetic number, because the mean of its divisors is an integer number (16658813853).

Almost surely, 2^66635255406 is an apocalyptic number.

66635255406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66635255406 is a wasteful number, since it uses less digits than its factorization.

66635255406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11105875906.

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 66635255406 in words is "sixty-six billion, six hundred thirty-five million, two hundred fifty-five thousand, four hundred six".