673305561 has 16 divisors (see below), whose sum is σ = 998046720. Its totient is φ = 448619760.

The previous prime is 673305533. The next prime is 673305599. The reversal of 673305561 is 165503376.

It is a happy number.

673305561 is a `hidden beast` number, since 6 + 73 + 30 + 556 + 1 = 666.

It is not a de Polignac number, because 673305561 - 2⁶ = 673305497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673305161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51091 + ... + 62903.

It is an arithmetic number, because the mean of its divisors is an integer number (62377920).

Almost surely, 2^673305561 is an apocalyptic number.

It is an amenable number.

673305561 is a deficient number, since it is larger than the sum of its proper divisors (324741159).

673305561 is a wasteful number, since it uses less digits than its factorization.

673305561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13933 (or 13927 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 36.

The square root of 673305561 is about 25948.1321293075. The cubic root of 673305561 is about 876.4706960906.

The spelling of 673305561 in words is "six hundred seventy-three million, three hundred five thousand, five hundred sixty-one".