661095973 has 2 divisors, whose sum is σ = 661095974. Its totient is φ = 661095972.

The previous prime is 661095947. The next prime is 661096063. The reversal of 661095973 is 379590166.

661095973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360316324 + 300779649 = 18982^2 + 17343^2 .

It is a cyclic number.

It is not a de Polignac number, because 661095973 - 2²⁹ = 124225061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661095943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330547986 + 330547987.

It is an arithmetic number, because the mean of its divisors is an integer number (330547987).

Almost surely, 2^661095973 is an apocalyptic number.

It is an amenable number.

661095973 is a deficient number, since it is larger than the sum of its proper divisors (1).

661095973 is an equidigital number, since it uses as much as digits as its factorization.

661095973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 661095973 is about 25711.7866551510. The cubic root of 661095973 is about 871.1404311422.

The spelling of 661095973 in words is "six hundred sixty-one million, ninety-five thousand, nine hundred seventy-three".