19647242261 has 8 divisors (see below), whose sum is σ = 20993817240. Its totient is φ = 18321873408.

The previous prime is 19647242231. The next prime is 19647242287. The reversal of 19647242261 is 16224274691.

It can be written as a sum of positive squares in 4 ways, for example, as 7855454161 + 11791788100 = 88631^2 + 108590^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19647242261 - 2¹⁴ = 19647225877 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 (19647242231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5299616 + ... + 5303321.

It is an arithmetic number, because the mean of its divisors is an integer number (2624227155).

Almost surely, 2^19647242261 is an apocalyptic number.

It is an amenable number.

19647242261 is a deficient number, since it is larger than the sum of its proper divisors (1346574979).

19647242261 is a wasteful number, since it uses less digits than its factorization.

19647242261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10603063.

The product of its digits is 290304, while the sum is 44.

The spelling of 19647242261 in words is "nineteen billion, six hundred forty-seven million, two hundred forty-two thousand, two hundred sixty-one".