863825553 has 10 divisors (see below), whose sum is σ = 1290406194. Its totient is φ = 575883648.

The previous prime is 863825537. The next prime is 863825591. The reversal of 863825553 is 355528368.

863825553 is a `hidden beast` number, since 8 + 638 + 2 + 5 + 5 + 5 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 742671504 + 121154049 = 27252^2 + 11007^2 .

It is not a de Polignac number, because 863825553 - 2⁴ = 863825537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 863825499 and 863825508.

It is not an unprimeable number, because it can be changed into a prime (863825533) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5332176 + ... + 5332337.

Almost surely, 2^863825553 is an apocalyptic number.

It is an amenable number.

863825553 is a deficient number, since it is larger than the sum of its proper divisors (426580641).

863825553 is a wasteful number, since it uses less digits than its factorization.

863825553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10664525 (or 10664516 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 863825553 is about 29390.9093598684. The cubic root of 863825553 is about 952.3765256276.

It can be divided in two parts, 8638 and 25553, that added together give a triangular number (34191 = T₂₆₁).

The spelling of 863825553 in words is "eight hundred sixty-three million, eight hundred twenty-five thousand, five hundred fifty-three".