561671241381 has 24 divisors (see below), whose sum is σ = 813086164800. Its totient is φ = 373624768896.

The previous prime is 561671241361. The next prime is 561671241463. The reversal of 561671241381 is 183142176165.

561671241381 is a `hidden beast` number, since 5 + 616 + 7 + 1 + 24 + 1 + 3 + 8 + 1 = 666.

It is not a de Polignac number, because 561671241381 - 2⁶ = 561671241317 is a prime.

It is a super-3 number, since 3×561671241381³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561671241361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28505725 + ... + 28525421.

It is an arithmetic number, because the mean of its divisors is an integer number (33878590200).

Almost surely, 2^561671241381 is an apocalyptic number.

It is an amenable number.

561671241381 is a deficient number, since it is larger than the sum of its proper divisors (251414923419).

561671241381 is a wasteful number, since it uses less digits than its factorization.

561671241381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26505 (or 26502 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 561671241381 in words is "five hundred sixty-one billion, six hundred seventy-one million, two hundred forty-one thousand, three hundred eighty-one".