661442303144 has 64 divisors (see below), whose sum is σ = 1423982851200. Its totient is φ = 282154881024.

The previous prime is 661442303129. The next prime is 661442303147. The reversal of 661442303144 is 441303244166.

It is a junction number, because it is equal to n+sod(n) for n = 661442303098 and 661442303107.

It is not an unprimeable number, because it can be changed into a prime (661442303147) 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, 43142072 + ... + 43157400.

It is an arithmetic number, because the mean of its divisors is an integer number (22249732050).

Almost surely, 2^661442303144 is an apocalyptic number.

It is an amenable number.

661442303144 is an abundant number, since it is smaller than the sum of its proper divisors (762540548056).

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

661442303144 is a wasteful number, since it uses less digits than its factorization.

661442303144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18882 (or 18878 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 661442303144 in words is "six hundred sixty-one billion, four hundred forty-two million, three hundred three thousand, one hundred forty-four".