661652551424256 has 144 divisors (see below), whose sum is σ = 2014869396019200. Its totient is φ = 188823510779904.

The previous prime is 661652551424233. The next prime is 661652551424287. The reversal of 661652551424256 is 652424155256166.

It is a self number, because there is not a number n which added to its sum of digits gives 661652551424256.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 67020696 + ... + 76256663.

Almost surely, 2^{661652551424256} is an apocalyptic number.

It is an amenable number.

661652551424256 is an abundant number, since it is smaller than the sum of its proper divisors (1353216844594944).

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

661652551424256 is a wasteful number, since it uses less digits than its factorization.

661652551424256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143278244 (or 143278230 counting only the distinct ones).

The product of its digits is 103680000, while the sum is 60.

The spelling of 661652551424256 in words is "six hundred sixty-one trillion, six hundred fifty-two billion, five hundred fifty-one million, four hundred twenty-four thousand, two hundred fifty-six".