987782197825 has 6 divisors (see below), whose sum is σ = 1224849925334. Its totient is φ = 790225758240.

The previous prime is 987782197811. The next prime is 987782197847. The reversal of 987782197825 is 528791287789.

It can be written as a sum of positive squares in 3 ways, for example, as 222066195121 + 765716002704 = 471239^2 + 875052^2 .

It is not a de Polignac number, because 987782197825 - 2⁵ = 987782197793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 19755643932 + ... + 19755643981.

Almost surely, 2^987782197825 is an apocalyptic number.

It is an amenable number.

987782197825 is a deficient number, since it is larger than the sum of its proper divisors (237067727509).

987782197825 is a wasteful number, since it uses less digits than its factorization.

987782197825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39511287923 (or 39511287918 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 73.

The spelling of 987782197825 in words is "nine hundred eighty-seven billion, seven hundred eighty-two million, one hundred ninety-seven thousand, eight hundred twenty-five".