661360453248 has 128 divisors (see below), whose sum is σ = 1931533885440. Its totient is φ = 198834048000.

The previous prime is 661360453219. The next prime is 661360453261. The reversal of 661360453248 is 842354063166.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 661360453197 and 661360453206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79978 + ... + 1152873.

It is an arithmetic number, because the mean of its divisors is an integer number (15090108480).

Almost surely, 2^661360453248 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 661360453248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (965766942720).

661360453248 is an abundant number, since it is smaller than the sum of its proper divisors (1270173432192).

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

661360453248 is a wasteful number, since it uses less digits than its factorization.

661360453248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233006 (or 1232994 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 661360453248 in words is "six hundred sixty-one billion, three hundred sixty million, four hundred fifty-three thousand, two hundred forty-eight".