661601740 has 24 divisors (see below), whose sum is σ = 1391558112. Its totient is φ = 264222720.

The previous prime is 661601687. The next prime is 661601753. The reversal of 661601740 is 47106166.

661601740 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 12984 + ... + 38623.

It is an arithmetic number, because the mean of its divisors is an integer number (57981588).

Almost surely, 2^661601740 is an apocalyptic number.

It is an amenable number.

661601740 is an abundant number, since it is smaller than the sum of its proper divisors (729956372).

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

661601740 is a wasteful number, since it uses less digits than its factorization.

661601740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52257 (or 52255 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 661601740 is about 25721.6200889446. The cubic root of 661601740 is about 871.3625278777.

The spelling of 661601740 in words is "six hundred sixty-one million, six hundred one thousand, seven hundred forty".