661247338 has 8 divisors (see below), whose sum is σ = 1008682560. Its totient is φ = 325019820.

The previous prime is 661247333. The next prime is 661247341. The reversal of 661247338 is 833742166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 661247338.

It is not an unprimeable number, because it can be changed into a prime (661247333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2801778 + ... + 2802013.

It is an arithmetic number, because the mean of its divisors is an integer number (126085320).

Almost surely, 2^661247338 is an apocalyptic number.

661247338 is a deficient number, since it is larger than the sum of its proper divisors (347435222).

661247338 is a wasteful number, since it uses less digits than its factorization.

661247338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5603852.

The product of its digits is 145152, while the sum is 40.

The square root of 661247338 is about 25714.7299810828. The cubic root of 661247338 is about 871.2069117111.

The spelling of 661247338 in words is "six hundred sixty-one million, two hundred forty-seven thousand, three hundred thirty-eight".