515661345 has 24 divisors (see below), whose sum is σ = 894531456. Its totient is φ = 274798368.

The previous prime is 515661329. The next prime is 515661353. The reversal of 515661345 is 543166515.

515661345 is a `hidden beast` number, since 51 + 566 + 1 + 3 + 45 = 666.

It is not a de Polignac number, because 515661345 - 2⁴ = 515661329 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62872 + ... + 70598.

It is an arithmetic number, because the mean of its divisors is an integer number (37272144).

Almost surely, 2^515661345 is an apocalyptic number.

It is an amenable number.

515661345 is a deficient number, since it is larger than the sum of its proper divisors (378870111).

515661345 is a wasteful number, since it uses less digits than its factorization.

515661345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9221 (or 9218 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 515661345 is about 22708.1779321900. The cubic root of 515661345 is about 801.9024229186.

The spelling of 515661345 in words is "five hundred fifteen million, six hundred sixty-one thousand, three hundred forty-five".