55621030356565 has 4 divisors (see below), whose sum is σ = 66745236427884. Its totient is φ = 44496824285248.

The previous prime is 55621030356527. The next prime is 55621030356583. The reversal of 55621030356565 is 56565303012655.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34255724359921 + 21365305996644 = 5852839^2 + 4622262^2 .

It is a cyclic number.

It is not a de Polignac number, because 55621030356565 - 2⁹ = 55621030356053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5562103035652 + ... + 5562103035661.

It is an arithmetic number, because the mean of its divisors is an integer number (16686309106971).

Almost surely, 2^{55621030356565} is an apocalyptic number.

It is an amenable number.

55621030356565 is a deficient number, since it is larger than the sum of its proper divisors (11124206071319).

55621030356565 is a wasteful number, since it uses less digits than its factorization.

55621030356565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11124206071318.

The product of its (nonzero) digits is 12150000, while the sum is 52.

The spelling of 55621030356565 in words is "fifty-five trillion, six hundred twenty-one billion, thirty million, three hundred fifty-six thousand, five hundred sixty-five".