19752113917 has 18 divisors (see below), whose sum is σ = 20957020062. Its totient is φ = 18613634544.

The previous prime is 19752113873. The next prime is 19752113947. The reversal of 19752113917 is 71931125791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17157332196 + 2594781721 = 130986^2 + 50939^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19752113917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19752113947) 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 in 17 ways as a sum of consecutive naturals, for example, 51571908 + ... + 51572290.

Almost surely, 2^19752113917 is an apocalyptic number.

It is an amenable number.

19752113917 is a deficient number, since it is larger than the sum of its proper divisors (1204906145).

19752113917 is an frugal number, since it uses more digits than its factorization.

19752113917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177 (or 775 counting only the distinct ones).

The product of its digits is 119070, while the sum is 46.

The spelling of 19752113917 in words is "nineteen billion, seven hundred fifty-two million, one hundred thirteen thousand, nine hundred seventeen".