919475785449 has 81 divisors (see below), whose sum is σ = 1504809193797. Its totient is φ = 540723598272.

The previous prime is 919475785439. The next prime is 919475785451. The reversal of 919475785449 is 944587574919.

The square root of 919475785449 is 958893.

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

919475785449 is a `hidden beast` number, since 9 + 1 + 9 + 4 + 7 + 5 + 78 + 544 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 154956386025 + 764519399424 = 393645^2 + 874368^2 .

It is not a de Polignac number, because 919475785449 - 2¹³ = 919475777257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (919475785439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 860126487 + ... + 860127555.

Almost surely, 2^919475785449 is an apocalyptic number.

919475785449 is the 958893-rd square number.

919475785449 is the 479447-th centered octagonal number.

It is an amenable number.

919475785449 is a deficient number, since it is larger than the sum of its proper divisors (585333408348).

919475785449 is a wasteful number, since it uses less digits than its factorization.

919475785449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216 (or 1108 counting only the distinct ones).

The product of its digits is 457228800, while the sum is 72.

The spelling of 919475785449 in words is "nine hundred nineteen billion, four hundred seventy-five million, seven hundred eighty-five thousand, four hundred forty-nine".