55566566520215 has 4 divisors (see below), whose sum is σ = 66679879824264. Its totient is φ = 44453253216168.

The previous prime is 55566566520211. The next prime is 55566566520233. The reversal of 55566566520215 is 51202566566555.

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

It is a cyclic number.

It is not a de Polignac number, because 55566566520215 - 2² = 55566566520211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55566566520211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5556656652017 + ... + 5556656652026.

It is an arithmetic number, because the mean of its divisors is an integer number (16669969956066).

Almost surely, 2^{55566566520215} is an apocalyptic number.

55566566520215 is a deficient number, since it is larger than the sum of its proper divisors (11113313304049).

55566566520215 is a wasteful number, since it uses less digits than its factorization.

55566566520215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11113313304048.

The product of its (nonzero) digits is 81000000, while the sum is 59.

The spelling of 55566566520215 in words is "fifty-five trillion, five hundred sixty-six billion, five hundred sixty-six million, five hundred twenty thousand, two hundred fifteen".