67531055661 has 12 divisors (see below), whose sum is σ = 97547415420. Its totient is φ = 45019523520.

The previous prime is 67531055611. The next prime is 67531055671. The reversal of 67531055661 is 16655013576.

67531055661 is a `hidden beast` number, since 6 + 7 + 5 + 31 + 0 + 556 + 61 = 666.

67531055661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 21039502500 + 46491553161 = 145050^2 + 215619^2 .

It is not a de Polignac number, because 67531055661 - 2⁷ = 67531055533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67531055611) 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, 393451 + ... + 538391.

It is an arithmetic number, because the mean of its divisors is an integer number (8128951285).

Almost surely, 2^67531055661 is an apocalyptic number.

It is an amenable number.

67531055661 is a deficient number, since it is larger than the sum of its proper divisors (30016359759).

67531055661 is a wasteful number, since it uses less digits than its factorization.

67531055661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196716 (or 196713 counting only the distinct ones).

The product of its (nonzero) digits is 567000, while the sum is 45.

The spelling of 67531055661 in words is "sixty-seven billion, five hundred thirty-one million, fifty-five thousand, six hundred sixty-one".