19618249568 has 24 divisors (see below), whose sum is σ = 38789209368. Its totient is φ = 9767021824.

The previous prime is 19618249559. The next prime is 19618249601. The reversal of 19618249568 is 86594281691.

It is a happy number.

It is a super-2 number, since 2×19618249568² (a number of 21 digits) contains 22 as substring.

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, 1308146 + ... + 1323057.

It is an arithmetic number, because the mean of its divisors is an integer number (1616217057).

Almost surely, 2^19618249568 is an apocalyptic number.

It is an amenable number.

19618249568 is a deficient number, since it is larger than the sum of its proper divisors (19170959800).

19618249568 is a wasteful number, since it uses less digits than its factorization.

19618249568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631446 (or 2631438 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 59.

The spelling of 19618249568 in words is "nineteen billion, six hundred eighteen million, two hundred forty-nine thousand, five hundred sixty-eight".