661110065655 has 16 divisors (see below), whose sum is σ = 1139143498080. Its totient is φ = 325469570688.

The previous prime is 661110065641. The next prime is 661110065711. The reversal of 661110065655 is 556560011166.

It is not a de Polignac number, because 661110065655 - 2¹² = 661110061559 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1695153820 + ... + 1695154209.

It is an arithmetic number, because the mean of its divisors is an integer number (71196468630).

Almost surely, 2^661110065655 is an apocalyptic number.

661110065655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

661110065655 is a deficient number, since it is larger than the sum of its proper divisors (478033432425).

661110065655 is a wasteful number, since it uses less digits than its factorization.

661110065655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390308050.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 661110065655 in words is "six hundred sixty-one billion, one hundred ten million, sixty-five thousand, six hundred fifty-five".