515661161089 has 2 divisors, whose sum is σ = 515661161090. Its totient is φ = 515661161088.

The previous prime is 515661161053. The next prime is 515661161107. The reversal of 515661161089 is 980161166515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492288866689 + 23372294400 = 701633^2 + 152880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-515661161089 is a prime.

It is not a weakly prime, because it can be changed into another prime (515661161989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257830580544 + 257830580545.

It is an arithmetic number, because the mean of its divisors is an integer number (257830580545).

Almost surely, 2^515661161089 is an apocalyptic number.

It is an amenable number.

515661161089 is a deficient number, since it is larger than the sum of its proper divisors (1).

515661161089 is an equidigital number, since it uses as much as digits as its factorization.

515661161089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 49.

The spelling of 515661161089 in words is "five hundred fifteen billion, six hundred sixty-one million, one hundred sixty-one thousand, eighty-nine".