666678888898 has 16 divisors (see below), whose sum is σ = 1091687258880. Its totient is φ = 302825256400.

The previous prime is 666678888851. The next prime is 666678888899. The reversal of 666678888898 is 898888876666.

It is not an unprimeable number, because it can be changed into a prime (666678888899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10497733 + ... + 10561048.

It is an arithmetic number, because the mean of its divisors is an integer number (68230453680).

Almost surely, 2^666678888898 is an apocalyptic number.

666678888898 is a deficient number, since it is larger than the sum of its proper divisors (425008369982).

666678888898 is a wasteful number, since it uses less digits than its factorization.

666678888898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21060233.

The product of its digits is 21403533312, while the sum is 88.

The spelling of 666678888898 in words is "six hundred sixty-six billion, six hundred seventy-eight million, eight hundred eighty-eight thousand, eight hundred ninety-eight".