655636538 has 4 divisors (see below), whose sum is σ = 983454810. Its totient is φ = 327818268.

The previous prime is 655636537. The next prime is 655636543. The reversal of 655636538 is 835636556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 407353489 + 248283049 = 20183^2 + 15757^2 .

It is a junction number, because it is equal to n+sod(n) for n = 655636492 and 655636501.

It is not an unprimeable number, because it can be changed into a prime (655636537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163909133 + ... + 163909136.

Almost surely, 2^655636538 is an apocalyptic number.

655636538 is a deficient number, since it is larger than the sum of its proper divisors (327818272).

655636538 is a wasteful number, since it uses less digits than its factorization.

655636538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327818271.

The product of its digits is 1944000, while the sum is 47.

The square root of 655636538 is about 25605.4005631625. The cubic root of 655636538 is about 868.7357945471.

The spelling of 655636538 in words is "six hundred fifty-five million, six hundred thirty-six thousand, five hundred thirty-eight".