19009512618 has 16 divisors (see below), whose sum is σ = 38500279680. Its totient is φ = 6256295136.

The previous prime is 19009512617. The next prime is 19009512619. The reversal of 19009512618 is 81621590091.

It is an interprime number because it is at equal distance from previous prime (19009512617) and next prime (19009512619).

It is a super-2 number, since 2×19009512618² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19009512618.

It is not an unprimeable number, because it can be changed into a prime (19009512617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20051755 + ... + 20052702.

It is an arithmetic number, because the mean of its divisors is an integer number (2406267480).

Almost surely, 2^19009512618 is an apocalyptic number.

19009512618 is an abundant number, since it is smaller than the sum of its proper divisors (19490767062).

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

19009512618 is a wasteful number, since it uses less digits than its factorization.

19009512618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40104541.

The product of its (nonzero) digits is 38880, while the sum is 42.

The spelling of 19009512618 in words is "nineteen billion, nine million, five hundred twelve thousand, six hundred eighteen".