19436680866 has 16 divisors (see below), whose sum is σ = 38889434304. Its totient is φ = 6476214864.

The previous prime is 19436680859. The next prime is 19436680903. The reversal of 19436680866 is 66808663491.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653941 + ... + 683016.

It is an arithmetic number, because the mean of its divisors is an integer number (2430589644).

Almost surely, 2^19436680866 is an apocalyptic number.

19436680866 is an abundant number, since it is smaller than the sum of its proper divisors (19452753438).

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

19436680866 is a wasteful number, since it uses less digits than its factorization.

19436680866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339385.

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 19436680866 in words is "nineteen billion, four hundred thirty-six million, six hundred eighty thousand, eight hundred sixty-six".