19661317532 has 6 divisors (see below), whose sum is σ = 34407305688. Its totient is φ = 9830658764.

The previous prime is 19661317531. The next prime is 19661317537. The reversal of 19661317532 is 23571316691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19661317531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2457664688 + ... + 2457664695.

It is an arithmetic number, because the mean of its divisors is an integer number (5734550948).

Almost surely, 2^19661317532 is an apocalyptic number.

It is an amenable number.

19661317532 is a deficient number, since it is larger than the sum of its proper divisors (14745988156).

19661317532 is a wasteful number, since it uses less digits than its factorization.

19661317532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4915329387 (or 4915329385 counting only the distinct ones).

The product of its digits is 204120, while the sum is 44.

The spelling of 19661317532 in words is "nineteen billion, six hundred sixty-one million, three hundred seventeen thousand, five hundred thirty-two".