661663365060 has 48 divisors (see below), whose sum is σ = 1852693920000. Its totient is φ = 176440088064.

The previous prime is 661663365053. The next prime is 661663365061. The reversal of 661663365060 is 60563366166.

661663365060 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661663365061) 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, 4782741 + ... + 4919139.

It is an arithmetic number, because the mean of its divisors is an integer number (38597790000).

Almost surely, 2^661663365060 is an apocalyptic number.

661663365060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661663365060 is an abundant number, since it is smaller than the sum of its proper divisors (1191030554940).

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

661663365060 is a wasteful number, since it uses less digits than its factorization.

661663365060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217260 (or 217258 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 48.

The spelling of 661663365060 in words is "six hundred sixty-one billion, six hundred sixty-three million, three hundred sixty-five thousand, sixty".