19961697429 has 28 divisors (see below), whose sum is σ = 30658872972. Its totient is φ = 12983198400.

The previous prime is 19961697409. The next prime is 19961697439. The reversal of 19961697429 is 92479616991.

19961697429 is a `hidden beast` number, since 1 + 9 + 9 + 616 + 9 + 7 + 4 + 2 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8879292900 + 11082404529 = 94230^2 + 105273^2 .

It is not a de Polignac number, because 19961697429 - 2¹² = 19961693333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19961697409) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 304042 + ... + 363819.

It is an arithmetic number, because the mean of its divisors is an integer number (1094959749).

Almost surely, 2^19961697429 is an apocalyptic number.

It is an amenable number.

19961697429 is a deficient number, since it is larger than the sum of its proper divisors (10697175543).

19961697429 is an frugal number, since it uses more digits than its factorization.

19961697429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667920 (or 667905 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 63.

The spelling of 19961697429 in words is "nineteen billion, nine hundred sixty-one million, six hundred ninety-seven thousand, four hundred twenty-nine".