660188687420 has 12 divisors (see below), whose sum is σ = 1386396243624. Its totient is φ = 264075474960.

The previous prime is 660188687309. The next prime is 660188687423. The reversal of 660188687420 is 24786881066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660188687423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16504717166 + ... + 16504717205.

It is an arithmetic number, because the mean of its divisors is an integer number (115533020302).

Almost surely, 2^660188687420 is an apocalyptic number.

It is an amenable number.

660188687420 is an abundant number, since it is smaller than the sum of its proper divisors (726207556204).

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

660188687420 is a wasteful number, since it uses less digits than its factorization.

660188687420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33009434380 (or 33009434378 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 660188687420 in words is "six hundred sixty billion, one hundred eighty-eight million, six hundred eighty-seven thousand, four hundred twenty".