661362100188 has 12 divisors (see below), whose sum is σ = 1543178233800. Its totient is φ = 220454033392.

The previous prime is 661362100187. The next prime is 661362100211. The reversal of 661362100188 is 881001263166.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661362100187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27556754163 + ... + 27556754186.

It is an arithmetic number, because the mean of its divisors is an integer number (128598186150).

Almost surely, 2^661362100188 is an apocalyptic number.

It is an amenable number.

661362100188 is an abundant number, since it is smaller than the sum of its proper divisors (881816133612).

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

661362100188 is a wasteful number, since it uses less digits than its factorization.

661362100188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55113508356 (or 55113508354 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 661362100188 in words is "six hundred sixty-one billion, three hundred sixty-two million, one hundred thousand, one hundred eighty-eight".