19497543616 has 56 divisors (see below), whose sum is σ = 38985600464. Its totient is φ = 9674588160.

The previous prime is 19497543607. The next prime is 19497543617. The reversal of 19497543616 is 61634579491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19497543617) 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, 12027286 + ... + 12028906.

Almost surely, 2^19497543616 is an apocalyptic number.

19497543616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19497543616 is a deficient number, since it is larger than the sum of its proper divisors (19488056848).

19497543616 is a wasteful number, since it uses less digits than its factorization.

19497543616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949 (or 2939 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 55.

The spelling of 19497543616 in words is "nineteen billion, four hundred ninety-seven million, five hundred forty-three thousand, six hundred sixteen".