61772775671721 has 16 divisors (see below), whose sum is σ = 82993629153600. Its totient is φ = 40866895392960.

The previous prime is 61772775671627. The next prime is 61772775671723. The reversal of 61772775671721 is 12717657727716.

61772775671721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61772775671721 - 2¹¹ = 61772775669673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61772775671723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27020331 + ... + 29217183.

It is an arithmetic number, because the mean of its divisors is an integer number (5187101822100).

Almost surely, 2^{61772775671721} is an apocalyptic number.

It is an amenable number.

61772775671721 is a deficient number, since it is larger than the sum of its proper divisors (21220853481879).

61772775671721 is a wasteful number, since it uses less digits than its factorization.

61772775671721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268536.

The product of its digits is 84707280, while the sum is 66.

The spelling of 61772775671721 in words is "sixty-one trillion, seven hundred seventy-two billion, seven hundred seventy-five million, six hundred seventy-one thousand, seven hundred twenty-one".