660873061 has 2 divisors, whose sum is σ = 660873062. Its totient is φ = 660873060.

The previous prime is 660873043. The next prime is 660873127. The reversal of 660873061 is 160378066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624500100 + 36372961 = 24990^2 + 6031^2 .

It is a cyclic number.

It is not a de Polignac number, because 660873061 - 2⁹ = 660872549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660873061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660873361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330436530 + 330436531.

It is an arithmetic number, because the mean of its divisors is an integer number (330436531).

Almost surely, 2^660873061 is an apocalyptic number.

It is an amenable number.

660873061 is a deficient number, since it is larger than the sum of its proper divisors (1).

660873061 is an equidigital number, since it uses as much as digits as its factorization.

660873061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 660873061 is about 25707.4514683973. The cubic root of 660873061 is about 871.0425081509.

The spelling of 660873061 in words is "six hundred sixty million, eight hundred seventy-three thousand, sixty-one".