66666673400 has 24 divisors (see below), whose sum is σ = 155000016120. Its totient is φ = 26666669280.

The previous prime is 66666673399. The next prime is 66666673429. The reversal of 66666673400 is 437666666.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

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 5 ways as a sum of consecutive naturals, for example, 166666484 + ... + 166666883.

It is an arithmetic number, because the mean of its divisors is an integer number (6458334005).

Almost surely, 2^66666673400 is an apocalyptic number.

It is an amenable number.

66666673400 is an abundant number, since it is smaller than the sum of its proper divisors (88333342720).

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

66666673400 is a wasteful number, since it uses less digits than its factorization.

66666673400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333333383 (or 333333374 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 50.

The spelling of 66666673400 in words is "sixty-six billion, six hundred sixty-six million, six hundred seventy-three thousand, four hundred".