661102645344 has 192 divisors, whose sum is σ = 1779350727168. Its totient is φ = 214863667200.

The previous prime is 661102645339. The next prime is 661102645361. The reversal of 661102645344 is 443546201166.

It is a junction number, because it is equal to n+sod(n) for n = 661102645296 and 661102645305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 564561879 + ... + 564563049.

It is an arithmetic number, because the mean of its divisors is an integer number (9267451704).

Almost surely, 2^661102645344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661102645344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889675363584).

661102645344 is an abundant number, since it is smaller than the sum of its proper divisors (1118248081824).

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

661102645344 is a wasteful number, since it uses less digits than its factorization.

661102645344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101 (or 2093 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 661102645344 in words is "six hundred sixty-one billion, one hundred two million, six hundred forty-five thousand, three hundred forty-four".