19694665740392 has 8 divisors (see below), whose sum is σ = 36927498263250. Its totient is φ = 9847332870192.

The previous prime is 19694665740391. The next prime is 19694665740397. The reversal of 19694665740392 is 29304756649691.

It can be written as a sum of positive squares in only one way, i.e., 12548271861316 + 7146393879076 = 3542354^2 + 2673274^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (19694665740391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1230916608767 + ... + 1230916608782.

Almost surely, 2^{19694665740392} is an apocalyptic number.

It is an amenable number.

19694665740392 is a deficient number, since it is larger than the sum of its proper divisors (17232832522858).

19694665740392 is a wasteful number, since it uses less digits than its factorization.

19694665740392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461833217555 (or 2461833217551 counting only the distinct ones).

The product of its (nonzero) digits is 529079040, while the sum is 71.

The spelling of 19694665740392 in words is "nineteen trillion, six hundred ninety-four billion, six hundred sixty-five million, seven hundred forty thousand, three hundred ninety-two".