42621326161 has 16 divisors (see below), whose sum is σ = 45427014864. Its totient is φ = 39849693184.

The previous prime is 42621326117. The next prime is 42621326171. The reversal of 42621326161 is 16162312624.

It can be written as a sum of positive squares in 8 ways, for example, as 770395536 + 41850930625 = 27756^2 + 204575^2 .

It is a cyclic number.

It is not a de Polignac number, because 42621326161 - 2²⁵ = 42587771729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42621326171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1565481 + ... + 1592473.

It is an arithmetic number, because the mean of its divisors is an integer number (2839188429).

Almost surely, 2^42621326161 is an apocalyptic number.

It is an amenable number.

42621326161 is a deficient number, since it is larger than the sum of its proper divisors (2805688703).

42621326161 is a wasteful number, since it uses less digits than its factorization.

42621326161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27620.

The product of its digits is 20736, while the sum is 34.

Adding to 42621326161 its reverse (16162312624), we get a palindrome (58783638785).

The spelling of 42621326161 in words is "forty-two billion, six hundred twenty-one million, three hundred twenty-six thousand, one hundred sixty-one".