661110102 has 48 divisors (see below), whose sum is σ = 1452250800. Its totient is φ = 217339200.

The previous prime is 661110031. The next prime is 661110143. The reversal of 661110102 is 201011166.

661110102 is a `hidden beast` number, since 661 + 1 + 1 + 0 + 1 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 426024 + ... + 427572.

It is an arithmetic number, because the mean of its divisors is an integer number (30255225).

Almost surely, 2^661110102 is an apocalyptic number.

661110102 is an abundant number, since it is smaller than the sum of its proper divisors (791140698).

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

661110102 is a wasteful number, since it uses less digits than its factorization.

661110102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869 (or 1866 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 661110102 is about 25712.0614109410. The cubic root of 661110102 is about 871.1466371274.

Adding to 661110102 its reverse (201011166), we get a palindrome (862121268).

The spelling of 661110102 in words is "six hundred sixty-one million, one hundred ten thousand, one hundred two".