863665552 has 40 divisors (see below), whose sum is σ = 1777995576. Its totient is φ = 405006336.

The previous prime is 863665531. The next prime is 863665567. The reversal of 863665552 is 255566368.

It can be written as a sum of positive squares in 4 ways, for example, as 327465216 + 536200336 = 18096^2 + 23156^2 .

It is a super-2 number, since 2×863665552² = 1491836371422929408, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74278 + ... + 85114.

Almost surely, 2^863665552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863665552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888997788).

863665552 is an abundant number, since it is smaller than the sum of its proper divisors (914330024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

863665552 is a wasteful number, since it uses less digits than its factorization.

863665552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11155 (or 11149 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 46.

The square root of 863665552 is about 29388.1872867314. The cubic root of 863665552 is about 952.3177210826.

The spelling of 863665552 in words is "eight hundred sixty-three million, six hundred sixty-five thousand, five hundred fifty-two".