19769172473 has 4 divisors (see below), whose sum is σ = 19913473140. Its totient is φ = 19624871808.

The previous prime is 19769172461. The next prime is 19769172491. The reversal of 19769172473 is 37427196791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37427196791 = 8059 ⋅4644149.

It can be written as a sum of positive squares in 2 ways, for example, as 10146935824 + 9622236649 = 100732^2 + 98093^2 .

It is a cyclic number.

It is not a de Polignac number, because 19769172473 - 2¹⁴ = 19769156089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19769172173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72150128 + ... + 72150401.

It is an arithmetic number, because the mean of its divisors is an integer number (4978368285).

Almost surely, 2^19769172473 is an apocalyptic number.

It is an amenable number.

19769172473 is a deficient number, since it is larger than the sum of its proper divisors (144300667).

19769172473 is a wasteful number, since it uses less digits than its factorization.

19769172473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144300666.

The product of its digits is 4000752, while the sum is 56.

The spelling of 19769172473 in words is "nineteen billion, seven hundred sixty-nine million, one hundred seventy-two thousand, four hundred seventy-three".