61556585968641 has 16 divisors (see below), whose sum is σ = 86397216215040. Its totient is φ = 38876940242640.

The previous prime is 61556585968561. The next prime is 61556585968673. The reversal of 61556585968641 is 14686958565516.

It is not a de Polignac number, because 61556585968641 - 2¹³ = 61556585960449 is a prime.

It is a super-2 number, since 2×61556585968641² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61556585968441) 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, 10070565 + ... + 14984306.

It is an arithmetic number, because the mean of its divisors is an integer number (5399826013440).

Almost surely, 2^{61556585968641} is an apocalyptic number.

It is an amenable number.

61556585968641 is a deficient number, since it is larger than the sum of its proper divisors (24840630246399).

61556585968641 is a wasteful number, since it uses less digits than its factorization.

61556585968641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25097996.

The product of its digits is 1866240000, while the sum is 75.

The spelling of 61556585968641 in words is "sixty-one trillion, five hundred fifty-six billion, five hundred eighty-five million, nine hundred sixty-eight thousand, six hundred forty-one".