661895461189 has 8 divisors (see below), whose sum is σ = 663812051328. Its totient is φ = 659979486240.

The previous prime is 661895461177. The next prime is 661895461207. The reversal of 661895461189 is 981164598166.

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

It is a cyclic number.

It is not a de Polignac number, because 661895461189 - 2⁷ = 661895461061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661895461189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661895461589) 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 7 ways as a sum of consecutive naturals, for example, 2046609 + ... + 2347849.

It is an arithmetic number, because the mean of its divisors is an integer number (82976506416).

Almost surely, 2^661895461189 is an apocalyptic number.

It is an amenable number.

661895461189 is a deficient number, since it is larger than the sum of its proper divisors (1916590139).

661895461189 is a wasteful number, since it uses less digits than its factorization.

661895461189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307595.

The product of its digits is 22394880, while the sum is 64.

The spelling of 661895461189 in words is "six hundred sixty-one billion, eight hundred ninety-five million, four hundred sixty-one thousand, one hundred eighty-nine".