71569712061 has 6 divisors (see below), whose sum is σ = 103378472990. Its totient is φ = 47713141368.

The previous prime is 71569712041. The next prime is 71569712101. The reversal of 71569712061 is 16021796517.

71569712061 is a `hidden beast` number, since 7 + 1 + 569 + 7 + 1 + 20 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 71569625625 + 86436 = 267525^2 + 294^2 .

It is not a de Polignac number, because 71569712061 - 2⁵ = 71569712029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71569711998 and 71569712016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71569712041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3976095106 + ... + 3976095123.

Almost surely, 2^71569712061 is an apocalyptic number.

It is an amenable number.

71569712061 is a deficient number, since it is larger than the sum of its proper divisors (31808760929).

71569712061 is a wasteful number, since it uses less digits than its factorization.

71569712061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7952190235 (or 7952190232 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The spelling of 71569712061 in words is "seventy-one billion, five hundred sixty-nine million, seven hundred twelve thousand, sixty-one".