515666081680 has 20 divisors (see below), whose sum is σ = 1198923640092. Its totient is φ = 206266432640.

The previous prime is 515666081677. The next prime is 515666081681. The reversal of 515666081680 is 86180666515.

It can be written as a sum of positive squares in 2 ways, for example, as 145554458256 + 370111623424 = 381516^2 + 608368^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (515666081681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3222912931 + ... + 3222913090.

Almost surely, 2^515666081680 is an apocalyptic number.

It is an amenable number.

515666081680 is an abundant number, since it is smaller than the sum of its proper divisors (683257558412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

515666081680 is a wasteful number, since it uses less digits than its factorization.

515666081680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445826034 (or 6445826028 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 515666081680 in words is "five hundred fifteen billion, six hundred sixty-six million, eighty-one thousand, six hundred eighty".