42157576861 has 4 divisors (see below), whose sum is σ = 42164307900. Its totient is φ = 42150845824.

The previous prime is 42157576849. The next prime is 42157576891. The reversal of 42157576861 is 16867575124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23173972900 + 18983603961 = 152230^2 + 137781^2 .

It is a cyclic number.

It is not a de Polignac number, because 42157576861 - 2⁷ = 42157576733 is a prime.

It is a super-2 number, since 2×42157576861² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42157576799 and 42157576808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42157576841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3356116 + ... + 3368653.

It is an arithmetic number, because the mean of its divisors is an integer number (10541076975).

Almost surely, 2^42157576861 is an apocalyptic number.

It is an amenable number.

42157576861 is a deficient number, since it is larger than the sum of its proper divisors (6731039).

42157576861 is an equidigital number, since it uses as much as digits as its factorization.

42157576861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731038.

The product of its digits is 2822400, while the sum is 52.

It can be divided in two parts, 421575 and 76861, that added together give a square (498436 = 706²).

The spelling of 42157576861 in words is "forty-two billion, one hundred fifty-seven million, five hundred seventy-six thousand, eight hundred sixty-one".