19451497368 has 16 divisors (see below), whose sum is σ = 48628743480. Its totient is φ = 6483832448.

The previous prime is 19451497337. The next prime is 19451497379. The reversal of 19451497368 is 86379415491.

It is a happy number.

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, 405239505 + ... + 405239552.

Almost surely, 2^19451497368 is an apocalyptic number.

It is an amenable number.

19451497368 is an abundant number, since it is smaller than the sum of its proper divisors (29177246112).

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

19451497368 is a wasteful number, since it uses less digits than its factorization.

19451497368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810479066 (or 810479062 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 57.

The spelling of 19451497368 in words is "nineteen billion, four hundred fifty-one million, four hundred ninety-seven thousand, three hundred sixty-eight".