66677777890 has 8 divisors (see below), whose sum is σ = 120020000220. Its totient is φ = 26671111152.

The previous prime is 66677777879. The next prime is 66677777899. The reversal of 66677777890 is 9877777666.

66677777890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 54825754201 + 11852023689 = 234149^2 + 108867^2 .

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

It is a super-3 number, since 3×66677777890³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66677777899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3333888885 + ... + 3333888904.

Almost surely, 2^66677777890 is an apocalyptic number.

66677777890 is a deficient number, since it is larger than the sum of its proper divisors (53342222330).

66677777890 is a wasteful number, since it uses less digits than its factorization.

66677777890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667777796.

The product of its (nonzero) digits is 261382464, while the sum is 70.

The spelling of 66677777890 in words is "sixty-six billion, six hundred seventy-seven million, seven hundred seventy-seven thousand, eight hundred ninety".