66667674778100 has 72 divisors (see below), whose sum is σ = 157826540621568. Its totient is φ = 24241873420800.

The previous prime is 66667674778073. The next prime is 66667674778129. The reversal of 66667674778100 is 187747676666.

66667674778100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66667674778100² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28277309 + ... + 30544091.

Almost surely, 2^{66667674778100} is an apocalyptic number.

It is an amenable number.

66667674778100 is an abundant number, since it is smaller than the sum of its proper divisors (91158865843468).

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

66667674778100 is a wasteful number, since it uses less digits than its factorization.

66667674778100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293545 (or 2293538 counting only the distinct ones).

The product of its (nonzero) digits is 597445632, while the sum is 71.

The spelling of 66667674778100 in words is "sixty-six trillion, six hundred sixty-seven billion, six hundred seventy-four million, seven hundred seventy-eight thousand, one hundred".