66677649294 has 16 divisors (see below), whose sum is σ = 137953757520. Its totient is φ = 21459473280.

The previous prime is 66677649281. The next prime is 66677649299. The reversal of 66677649294 is 49294677666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677649299) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 191602267 + ... + 191602614.

It is an arithmetic number, because the mean of its divisors is an integer number (8622109845).

Almost surely, 2^66677649294 is an apocalyptic number.

66677649294 is an abundant number, since it is smaller than the sum of its proper divisors (71276108226).

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

66677649294 is a wasteful number, since it uses less digits than its factorization.

66677649294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383204915.

The product of its digits is 164602368, while the sum is 66.

The spelling of 66677649294 in words is "sixty-six billion, six hundred seventy-seven million, six hundred forty-nine thousand, two hundred ninety-four".