673142661 has 6 divisors (see below), whose sum is σ = 972317190. Its totient is φ = 448761768.

The previous prime is 673142651. The next prime is 673142669. The reversal of 673142661 is 166241376.

It is a happy number.

673142661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 427248900 + 245893761 = 20670^2 + 15681^2 .

It is not a de Polignac number, because 673142661 - 2¹¹ = 673140613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673142669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37396806 + ... + 37396823.

It is an arithmetic number, because the mean of its divisors is an integer number (162052865).

Almost surely, 2^673142661 is an apocalyptic number.

It is an amenable number.

673142661 is a deficient number, since it is larger than the sum of its proper divisors (299174529).

673142661 is a wasteful number, since it uses less digits than its factorization.

673142661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74793635 (or 74793632 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 673142661 is about 25944.9929851600. The cubic root of 673142661 is about 876.4000057529.

The spelling of 673142661 in words is "six hundred seventy-three million, one hundred forty-two thousand, six hundred sixty-one".