661036338 has 24 divisors (see below), whose sum is σ = 1453624848. Its totient is φ = 217056312.

The previous prime is 661036331. The next prime is 661036351. The reversal of 661036338 is 833630166.

661036338 is a `hidden beast` number, since 6 + 6 + 10 + 3 + 633 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (661036331) 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, 272856 + ... + 275267.

It is an arithmetic number, because the mean of its divisors is an integer number (60567702).

Almost surely, 2^661036338 is an apocalyptic number.

661036338 is an abundant number, since it is smaller than the sum of its proper divisors (792588510).

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

661036338 is a wasteful number, since it uses less digits than its factorization.

661036338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548198 (or 548195 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 661036338 is about 25710.6269468483. The cubic root of 661036338 is about 871.1142362457.

The spelling of 661036338 in words is "six hundred sixty-one million, thirty-six thousand, three hundred thirty-eight".