61441438581 has 12 divisors (see below), whose sum is σ = 88750965420. Its totient is φ = 40959934080.

The previous prime is 61441438561. The next prime is 61441438657. The reversal of 61441438581 is 18583414416.

61441438581 is a `hidden beast` number, since 61 + 4 + 4 + 1 + 4 + 3 + 8 + 581 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 53125640100 + 8315798481 = 230490^2 + 91191^2 .

It is not a de Polignac number, because 61441438581 - 2⁵ = 61441438549 is a prime.

It is a super-2 number, since 2×61441438581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61441438561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 520315 + ... + 627383.

It is an arithmetic number, because the mean of its divisors is an integer number (7395913785).

Almost surely, 2^61441438581 is an apocalyptic number.

It is an amenable number.

61441438581 is a deficient number, since it is larger than the sum of its proper divisors (27309526839).

61441438581 is a wasteful number, since it uses less digits than its factorization.

61441438581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170836 (or 170833 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The spelling of 61441438581 in words is "sixty-one billion, four hundred forty-one million, four hundred thirty-eight thousand, five hundred eighty-one".