515542046561 has 2 divisors, whose sum is σ = 515542046562. Its totient is φ = 515542046560.

The previous prime is 515542046489. The next prime is 515542046581. The reversal of 515542046561 is 165640245515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 467624836561 + 47917210000 = 683831^2 + 218900^2 .

It is a cyclic number.

It is not a de Polignac number, because 515542046561 - 2¹⁰ = 515542045537 is a prime.

It is not a weakly prime, because it can be changed into another prime (515542046581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257771023280 + 257771023281.

It is an arithmetic number, because the mean of its divisors is an integer number (257771023281).

Almost surely, 2^515542046561 is an apocalyptic number.

It is an amenable number.

515542046561 is a deficient number, since it is larger than the sum of its proper divisors (1).

515542046561 is an equidigital number, since it uses as much as digits as its factorization.

515542046561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 515542046561 in words is "five hundred fifteen billion, five hundred forty-two million, forty-six thousand, five hundred sixty-one".