515870241361 has 2 divisors, whose sum is σ = 515870241362. Its totient is φ = 515870241360.

The previous prime is 515870241353. The next prime is 515870241391. The reversal of 515870241361 is 163142078515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383447031361 + 132423210000 = 619231^2 + 363900^2 .

It is a cyclic number.

It is not a de Polignac number, because 515870241361 - 2³ = 515870241353 is a prime.

It is a super-2 number, since 2×515870241361² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (515870241391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257935120680 + 257935120681.

It is an arithmetic number, because the mean of its divisors is an integer number (257935120681).

Almost surely, 2^515870241361 is an apocalyptic number.

It is an amenable number.

515870241361 is a deficient number, since it is larger than the sum of its proper divisors (1).

515870241361 is an equidigital number, since it uses as much as digits as its factorization.

515870241361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 515870241361 in words is "five hundred fifteen billion, eight hundred seventy million, two hundred forty-one thousand, three hundred sixty-one".