6610665111550 has 24 divisors (see below), whose sum is σ = 12311994651552. Its totient is φ = 2640791304000.

The previous prime is 6610665111539. The next prime is 6610665111551. The reversal of 6610665111550 is 551115660166.

It is a junction number, because it is equal to n+sod(n) for n = 6610665111497 and 6610665111506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6610665111551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86830086 + ... + 86906185.

It is an arithmetic number, because the mean of its divisors is an integer number (512999777148).

Almost surely, 2^{6610665111550} is an apocalyptic number.

6610665111550 is a deficient number, since it is larger than the sum of its proper divisors (5701329540002).

6610665111550 is a wasteful number, since it uses less digits than its factorization.

6610665111550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173737044 (or 173737039 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 6610665111550 in words is "six trillion, six hundred ten billion, six hundred sixty-five million, one hundred eleven thousand, five hundred fifty".