661746168287200 has 36 divisors (see below), whose sum is σ = 1615487833333080. Its totient is φ = 264698467314560.

The previous prime is 661746168287159. The next prime is 661746168287207. The reversal of 661746168287200 is 2782861647166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661746168287207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 413591354380 + ... + 413591355979.

It is an arithmetic number, because the mean of its divisors is an integer number (44874662037030).

Almost surely, 2^{661746168287200} is an apocalyptic number.

It is an amenable number.

661746168287200 is an abundant number, since it is smaller than the sum of its proper divisors (953741665045880).

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

661746168287200 is a wasteful number, since it uses less digits than its factorization.

661746168287200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827182710379 (or 827182710366 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 64.

The spelling of 661746168287200 in words is "six hundred sixty-one trillion, seven hundred forty-six billion, one hundred sixty-eight million, two hundred eighty-seven thousand, two hundred".