661041738 has 24 divisors (see below), whose sum is σ = 1636865568. Its totient is φ = 188869032.

The previous prime is 661041713. The next prime is 661041739. The reversal of 661041738 is 837140166.

661041738 is a `hidden beast` number, since 6 + 610 + 4 + 1 + 7 + 38 = 666.

661041738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661041739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2623056 + ... + 2623307.

It is an arithmetic number, because the mean of its divisors is an integer number (68202732).

Almost surely, 2^661041738 is an apocalyptic number.

661041738 is an abundant number, since it is smaller than the sum of its proper divisors (975823830).

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

661041738 is a wasteful number, since it uses less digits than its factorization.

661041738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5246378 (or 5246375 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 661041738 is about 25710.7319615759. The cubic root of 661041738 is about 871.1166082808.

The spelling of 661041738 in words is "six hundred sixty-one million, forty-one thousand, seven hundred thirty-eight".