661110086 has 24 divisors (see below), whose sum is σ = 1227221424. Its totient is φ = 261537120.

The previous prime is 661110031. The next prime is 661110143. The reversal of 661110086 is 680011166.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137345 + ... + 142076.

It is an arithmetic number, because the mean of its divisors is an integer number (51134226).

Almost surely, 2^661110086 is an apocalyptic number.

661110086 is a deficient number, since it is larger than the sum of its proper divisors (566111338).

661110086 is a wasteful number, since it uses less digits than its factorization.

661110086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279456 (or 279443 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 661110086 is about 25712.0610998029. The cubic root of 661110086 is about 871.1466300997.

The spelling of 661110086 in words is "six hundred sixty-one million, one hundred ten thousand, eighty-six".