55251221612636 has 48 divisors (see below), whose sum is σ = 116817581986560. Its totient is φ = 22336548543360.

The previous prime is 55251221612557. The next prime is 55251221612647. The reversal of 55251221612636 is 63621612215255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222742310 + ... + 222990221.

It is an arithmetic number, because the mean of its divisors is an integer number (2433699624720).

Almost surely, 2^{55251221612636} is an apocalyptic number.

It is an amenable number.

55251221612636 is an abundant number, since it is smaller than the sum of its proper divisors (61566360373924).

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

55251221612636 is a wasteful number, since it uses less digits than its factorization.

55251221612636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445732794 (or 445732792 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 47.

The spelling of 55251221612636 in words is "fifty-five trillion, two hundred fifty-one billion, two hundred twenty-one million, six hundred twelve thousand, six hundred thirty-six".