661667806666110 has 32 divisors (see below), whose sum is σ = 1609756198140960. Its totient is φ = 174027697095168.

The previous prime is 661667806666109. The next prime is 661667806666117. The reversal of 661667806666110 is 11666608766166.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661667806666117) 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, 151065707095 + ... + 151065711474.

It is an arithmetic number, because the mean of its divisors is an integer number (50304881191905).

Almost surely, 2^{661667806666110} is an apocalyptic number.

661667806666110 is an abundant number, since it is smaller than the sum of its proper divisors (948088391474850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661667806666110 is a wasteful number, since it uses less digits than its factorization.

661667806666110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302131418652.

The product of its (nonzero) digits is 94058496, while the sum is 66.

The spelling of 661667806666110 in words is "six hundred sixty-one trillion, six hundred sixty-seven billion, eight hundred six million, six hundred sixty-six thousand, one hundred ten".