517661404440772 has 12 divisors (see below), whose sum is σ = 905918294959020. Its totient is φ = 258827605881056.

The previous prime is 517661404440743. The next prime is 517661404440821. The reversal of 517661404440772 is 277044404166715.

It can be written as a sum of positive squares in 2 ways, for example, as 356405540234436 + 161255864206336 = 18878706^2 + 12698656^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773708647 + ... + 774377422.

It is an arithmetic number, because the mean of its divisors is an integer number (75493191246585).

Almost surely, 2^{517661404440772} is an apocalyptic number.

It is an amenable number.

517661404440772 is a deficient number, since it is larger than the sum of its proper divisors (388256890518248).

517661404440772 is a wasteful number, since it uses less digits than its factorization.

517661404440772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548169670 (or 1548169668 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 58.

The spelling of 517661404440772 in words is "five hundred seventeen trillion, six hundred sixty-one billion, four hundred four million, four hundred forty thousand, seven hundred seventy-two".