520860993849 has 27 divisors (see below), whose sum is σ = 875213667237. Its totient is φ = 297626193144.

The previous prime is 520860993827. The next prime is 520860993911. The reversal of 520860993849 is 948399068025.

The square root of 520860993849 is 721707.

It is a perfect power (a square), and thus also a powerful number.

520860993849 is a `hidden beast` number, since 520 + 8 + 60 + 9 + 9 + 3 + 8 + 49 = 666.

It is not a de Polignac number, because 520860993849 - 2²³ = 520852605241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (520860993049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15138664 + ... + 15173030.

Almost surely, 2^520860993849 is an apocalyptic number.

520860993849 is the 721707-th square number.

520860993849 is the 360854-th centered octagonal number.

It is an amenable number.

520860993849 is a deficient number, since it is larger than the sum of its proper divisors (354352673388).

520860993849 is an frugal number, since it uses more digits than its factorization.

520860993849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68754 (or 34377 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 520860993849 in words is "five hundred twenty billion, eight hundred sixty million, nine hundred ninety-three thousand, eight hundred forty-nine".