19236478455481 has 63 divisors (see below), whose sum is σ = 23721131235951. Its totient is φ = 15597388646784.

The previous prime is 19236478455419. The next prime is 19236478455487. The reversal of 19236478455481 is 18455487463291.

The square root of 19236478455481 is 4385941.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6295306812025 + 12941171643456 = 2509045^2 + 3597384^2 .

It is not a de Polignac number, because 19236478455481 - 2⁹ = 19236478454969 is a prime.

It is a super-2 number, since 2×19236478455481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19236478455487) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 28583177161 + ... + 28583177833.

Almost surely, 2^{19236478455481} is an apocalyptic number.

19236478455481 is the 4385941-st square number.

19236478455481 is the 2192971-st centered octagonal number.

It is an amenable number.

19236478455481 is a deficient number, since it is larger than the sum of its proper divisors (4484652780470).

19236478455481 is an frugal number, since it uses more digits than its factorization.

19236478455481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 699 counting only the distinct ones).

The product of its digits is 232243200, while the sum is 67.

The spelling of 19236478455481 in words is "nineteen trillion, two hundred thirty-six billion, four hundred seventy-eight million, four hundred fifty-five thousand, four hundred eighty-one".