19661377532 has 24 divisors (see below), whose sum is σ = 34933221120. Its totient is φ = 9680560560.

The previous prime is 19661377531. The next prime is 19661377607. The reversal of 19661377532 is 23577316691.

It is a super-2 number, since 2×19661377532² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19661377531) 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, 862157 + ... + 884667.

It is an arithmetic number, because the mean of its divisors is an integer number (1455550880).

Almost surely, 2^19661377532 is an apocalyptic number.

It is an amenable number.

19661377532 is a deficient number, since it is larger than the sum of its proper divisors (15271843588).

19661377532 is a wasteful number, since it uses less digits than its factorization.

19661377532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25841 (or 25839 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 50.

The spelling of 19661377532 in words is "nineteen billion, six hundred sixty-one million, three hundred seventy-seven thousand, five hundred thirty-two".