19542543664 has 80 divisors (see below), whose sum is σ = 47398305600. Its totient is φ = 7610867712.

The previous prime is 19542543661. The next prime is 19542543673. The reversal of 19542543664 is 46634524591.

It is a super-2 number, since 2×19542543664² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19542543661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121749 + ... + 232180.

It is an arithmetic number, because the mean of its divisors is an integer number (592478820).

Almost surely, 2^19542543664 is an apocalyptic number.

19542543664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19542543664 is an abundant number, since it is smaller than the sum of its proper divisors (27855761936).

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

19542543664 is a wasteful number, since it uses less digits than its factorization.

19542543664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353990 (or 353984 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 49.

The spelling of 19542543664 in words is "nineteen billion, five hundred forty-two million, five hundred forty-three thousand, six hundred sixty-four".