661547344 has 40 divisors (see below), whose sum is σ = 1341110592. Its totient is φ = 315532800.

The previous prime is 661547323. The next prime is 661547351. The reversal of 661547344 is 443745166.

661547344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 661547297 and 661547306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145327 + ... + 149809.

Almost surely, 2^661547344 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 661547344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670555296).

661547344 is an abundant number, since it is smaller than the sum of its proper divisors (679563248).

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

661547344 is a wasteful number, since it uses less digits than its factorization.

661547344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4915 (or 4909 counting only the distinct ones).

The product of its digits is 241920, while the sum is 40.

The square root of 661547344 is about 25720.5626688065. The cubic root of 661547344 is about 871.3386464738.

The spelling of 661547344 in words is "six hundred sixty-one million, five hundred forty-seven thousand, three hundred forty-four".