19989350461 has 8 divisors (see below), whose sum is σ = 20231484984. Its totient is φ = 19748083200.

The previous prime is 19989350443. The next prime is 19989350473. The reversal of 19989350461 is 16405398991.

It can be written as a sum of positive squares in 4 ways, for example, as 13318544836 + 6670805625 = 115406^2 + 81675^2 .

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 19989350461 - 2⁵ = 19989350429 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 (19989350411) 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, 170380 + ... + 262693.

It is an arithmetic number, because the mean of its divisors is an integer number (2528935623).

Almost surely, 2^19989350461 is an apocalyptic number.

It is an amenable number.

19989350461 is a deficient number, since it is larger than the sum of its proper divisors (242134523).

19989350461 is a wasteful number, since it uses less digits than its factorization.

19989350461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433631.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 19989350461 in words is "nineteen billion, nine hundred eighty-nine million, three hundred fifty thousand, four hundred sixty-one".