662561873 has 2 divisors, whose sum is σ = 662561874. Its totient is φ = 662561872.

The previous prime is 662561857. The next prime is 662561881. The reversal of 662561873 is 378165266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660335809 + 2226064 = 25697^2 + 1492^2 .

It is a cyclic number.

It is not a de Polignac number, because 662561873 - 2⁴ = 662561857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (662561803) 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 as a sum of consecutive naturals, namely, 331280936 + 331280937.

It is an arithmetic number, because the mean of its divisors is an integer number (331280937).

Almost surely, 2^662561873 is an apocalyptic number.

It is an amenable number.

662561873 is a deficient number, since it is larger than the sum of its proper divisors (1).

662561873 is an equidigital number, since it uses as much as digits as its factorization.

662561873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 662561873 is about 25740.2772518091. The cubic root of 662561873 is about 871.7838385059.

The spelling of 662561873 in words is "six hundred sixty-two million, five hundred sixty-one thousand, eight hundred seventy-three".