19901188618 has 16 divisors (see below), whose sum is σ = 31616452224. Its totient is φ = 9362692800.

The previous prime is 19901188609. The next prime is 19901188649. The reversal of 19901188618 is 81688110991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48193 + ... + 205243.

It is an arithmetic number, because the mean of its divisors is an integer number (1976028264).

Almost surely, 2^19901188618 is an apocalyptic number.

19901188618 is a deficient number, since it is larger than the sum of its proper divisors (11715263606).

19901188618 is a wasteful number, since it uses less digits than its factorization.

19901188618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160797.

The product of its (nonzero) digits is 248832, while the sum is 52.

The spelling of 19901188618 in words is "nineteen billion, nine hundred one million, one hundred eighty-eight thousand, six hundred eighteen".