61085328561 has 12 divisors (see below), whose sum is σ = 88259626000. Its totient is φ = 40711892760.

The previous prime is 61085328559. The next prime is 61085328649. The reversal of 61085328561 is 16582358016.

61085328561 is a `hidden beast` number, since 6 + 1 + 0 + 85 + 3 + 2 + 8 + 561 = 666.

It is not a de Polignac number, because 61085328561 - 2¹ = 61085328559 is a prime.

It is a super-4 number, since 4×61085328561⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61085328511) 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 11 ways as a sum of consecutive naturals, for example, 938395 + ... + 1001376.

Almost surely, 2^61085328561 is an apocalyptic number.

It is an amenable number.

61085328561 is a deficient number, since it is larger than the sum of its proper divisors (27174297439).

61085328561 is a wasteful number, since it uses less digits than its factorization.

61085328561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943276 (or 1943273 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 61085328561 in words is "sixty-one billion, eighty-five million, three hundred twenty-eight thousand, five hundred sixty-one".