673661661489 has 8 divisors (see below), whose sum is σ = 998017276320. Its totient is φ = 449107774308.

The previous prime is 673661661487. The next prime is 673661661493. The reversal of 673661661489 is 984166166376.

673661661489 is a `hidden beast` number, since 6 + 7 + 3 + 6 + 6 + 1 + 6 + 614 + 8 + 9 = 666.

673661661489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 673661661489 - 2¹ = 673661661487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673661661487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12475215927 + ... + 12475215980.

It is an arithmetic number, because the mean of its divisors is an integer number (124752159540).

Almost surely, 2^673661661489 is an apocalyptic number.

It is an amenable number.

673661661489 is a deficient number, since it is larger than the sum of its proper divisors (324355614831).

673661661489 is a wasteful number, since it uses less digits than its factorization.

673661661489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24950431916 (or 24950431910 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 63.

The spelling of 673661661489 in words is "six hundred seventy-three billion, six hundred sixty-one million, six hundred sixty-one thousand, four hundred eighty-nine".