661331419 has 4 divisors (see below), whose sum is σ = 755807344. Its totient is φ = 566855496.

The previous prime is 661331393. The next prime is 661331453. The reversal of 661331419 is 914133166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 661331419 - 2⁵ = 661331387 is a prime.

It is a super-2 number, since 2×661331419² = 874718491513107122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661331479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47237952 + ... + 47237965.

It is an arithmetic number, because the mean of its divisors is an integer number (188951836).

Almost surely, 2^661331419 is an apocalyptic number.

661331419 is a deficient number, since it is larger than the sum of its proper divisors (94475925).

661331419 is an equidigital number, since it uses as much as digits as its factorization.

661331419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94475924.

The product of its digits is 11664, while the sum is 34.

The square root of 661331419 is about 25716.3648092027. The cubic root of 661331419 is about 871.2438362926.

The spelling of 661331419 in words is "six hundred sixty-one million, three hundred thirty-one thousand, four hundred nineteen".