19613018836 has 12 divisors (see below), whose sum is σ = 34323770740. Its totient is φ = 9806227200.

The previous prime is 19613018807. The next prime is 19613018879. The reversal of 19613018836 is 63881031691.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17700705936 + 1912312900 = 133044^2 + 43730^2 .

It is a super-2 number, since 2×19613018836² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208036 + ... + 287236.

Almost surely, 2^19613018836 is an apocalyptic number.

It is an amenable number.

19613018836 is a deficient number, since it is larger than the sum of its proper divisors (14710751904).

19613018836 is a wasteful number, since it uses less digits than its factorization.

19613018836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141114 (or 141112 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 19613018836 in words is "nineteen billion, six hundred thirteen million, eighteen thousand, eight hundred thirty-six".