661018346 has 4 divisors (see below), whose sum is σ = 991527522. Its totient is φ = 330509172.

The previous prime is 661018343. The next prime is 661018381. The reversal of 661018346 is 643810166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 643810166 = 2 ⋅321905083.

It can be written as a sum of positive squares in only one way, i.e., 647142721 + 13875625 = 25439^2 + 3725^2 .

It is not an unprimeable number, because it can be changed into a prime (661018343) 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 as a sum of consecutive naturals, namely, 165254585 + ... + 165254588.

Almost surely, 2^661018346 is an apocalyptic number.

661018346 is a deficient number, since it is larger than the sum of its proper divisors (330509176).

661018346 is a wasteful number, since it uses less digits than its factorization.

661018346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330509175.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 661018346 is about 25710.2770502381. The cubic root of 661018346 is about 871.1063328832.

It can be divided in two parts, 66101 and 8346, that added together give a palindrome (74447).

The spelling of 661018346 in words is "six hundred sixty-one million, eighteen thousand, three hundred forty-six".