55561066665 has 16 divisors (see below), whose sum is σ = 95735992128. Its totient is φ = 27353140416.

The previous prime is 55561066661. The next prime is 55561066681. The reversal of 55561066665 is 56666016555.

It is not a de Polignac number, because 55561066665 - 2² = 55561066661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55561066661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142464079 + ... + 142464468.

It is an arithmetic number, because the mean of its divisors is an integer number (5983499508).

Almost surely, 2^55561066665 is an apocalyptic number.

It is an amenable number.

55561066665 is a deficient number, since it is larger than the sum of its proper divisors (40174925463).

55561066665 is a wasteful number, since it uses less digits than its factorization.

55561066665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284928568.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 55561066665 in words is "fifty-five billion, five hundred sixty-one million, sixty-six thousand, six hundred sixty-five".