36638521656 has 32 divisors (see below), whose sum is σ = 99923241600. Its totient is φ = 11102582240.

The previous prime is 36638521631. The next prime is 36638521697. The reversal of 36638521656 is 65612583663.

36638521656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 36638521599 and 36638521608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69390876 + ... + 69391403.

It is an arithmetic number, because the mean of its divisors is an integer number (3122601300).

Almost surely, 2^36638521656 is an apocalyptic number.

It is an amenable number.

36638521656 is an abundant number, since it is smaller than the sum of its proper divisors (63284719944).

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

36638521656 is a wasteful number, since it uses less digits than its factorization.

36638521656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138782299 (or 138782295 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 51.

The spelling of 36638521656 in words is "thirty-six billion, six hundred thirty-eight million, five hundred twenty-one thousand, six hundred fifty-six".