42915063819681 has 27 divisors (see below), whose sum is σ = 63181619740057. Its totient is φ = 28069549123200.

The previous prime is 42915063819673. The next prime is 42915063819743. The reversal of 42915063819681 is 18691836051924.

The square root of 42915063819681 is 6550959.

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

42915063819681 is a `hidden beast` number, since 4 + 2 + 9 + 1 + 506 + 38 + 1 + 96 + 8 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14385749051025 + 28529314768656 = 3792855^2 + 5341284^2 .

It is not a de Polignac number, because 42915063819681 - 2³ = 42915063819673 is a prime.

It is a super-2 number, since 2×42915063819681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42915063814681) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1041581881 + ... + 1041623081.

Almost surely, 2^{42915063819681} is an apocalyptic number.

42915063819681 is the 6550959-th square number.

42915063819681 is the 3275480-th centered octagonal number.

It is an amenable number.

42915063819681 is a deficient number, since it is larger than the sum of its proper divisors (20266555920376).

42915063819681 is an frugal number, since it uses more digits than its factorization.

42915063819681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82514 (or 41257 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 63.

The spelling of 42915063819681 in words is "forty-two trillion, nine hundred fifteen billion, sixty-three million, eight hundred nineteen thousand, six hundred eighty-one".