661110670 has 16 divisors (see below), whose sum is σ = 1298181168. Its totient is φ = 240403840.

The previous prime is 661110649. The next prime is 661110673. The reversal of 661110670 is 76011166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661110673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3004939 + ... + 3005158.

It is an arithmetic number, because the mean of its divisors is an integer number (81136323).

Almost surely, 2^661110670 is an apocalyptic number.

661110670 is a deficient number, since it is larger than the sum of its proper divisors (637070498).

661110670 is a wasteful number, since it uses less digits than its factorization.

661110670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6010115.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 661110670 is about 25712.0724563385. The cubic root of 661110670 is about 871.1468866124.

The spelling of 661110670 in words is "six hundred sixty-one million, one hundred ten thousand, six hundred seventy".