661341442 has 4 divisors (see below), whose sum is σ = 992012166. Its totient is φ = 330670720.

The previous prime is 661341437. The next prime is 661341481. The reversal of 661341442 is 244143166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 486599481 + 174741961 = 22059^2 + 13219^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165335359 + ... + 165335362.

Almost surely, 2^661341442 is an apocalyptic number.

661341442 is a deficient number, since it is larger than the sum of its proper divisors (330670724).

661341442 is a wasteful number, since it uses less digits than its factorization.

661341442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330670723.

The product of its digits is 13824, while the sum is 31.

The square root of 661341442 is about 25716.5596843746. The cubic root of 661341442 is about 871.2482377332.

It can be divided in two parts, 66134 and 1442, that added together give a palindrome (67576).

The spelling of 661341442 in words is "six hundred sixty-one million, three hundred forty-one thousand, four hundred forty-two".