661043424 has 48 divisors (see below), whose sum is σ = 1737097488. Its totient is φ = 220111872.

The previous prime is 661043381. The next prime is 661043447. The reversal of 661043424 is 424340166.

661043424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 661043391 and 661043400.

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, 102174 + ... + 108450.

It is an arithmetic number, because the mean of its divisors is an integer number (36189531).

Almost surely, 2^661043424 is an apocalyptic number.

It is an amenable number.

661043424 is an abundant number, since it is smaller than the sum of its proper divisors (1076054064).

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

661043424 is a wasteful number, since it uses less digits than its factorization.

661043424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7387 (or 7379 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 661043424 is about 25710.7647494196. The cubic root of 661043424 is about 871.1173488802.

The spelling of 661043424 in words is "six hundred sixty-one million, forty-three thousand, four hundred twenty-four".