71162780069 has 2 divisors, whose sum is σ = 71162780070. Its totient is φ = 71162780068.

The previous prime is 71162780057. The next prime is 71162780107. The reversal of 71162780069 is 96008726117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36887811844 + 34274968225 = 192062^2 + 185135^2 .

It is a cyclic number.

It is not a de Polignac number, because 71162780069 - 2⁴ = 71162780053 is a prime.

It is a super-2 number, since 2×71162780069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71162780869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35581390034 + 35581390035.

It is an arithmetic number, because the mean of its divisors is an integer number (35581390035).

Almost surely, 2^71162780069 is an apocalyptic number.

It is an amenable number.

71162780069 is a deficient number, since it is larger than the sum of its proper divisors (1).

71162780069 is an equidigital number, since it uses as much as digits as its factorization.

71162780069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 47.

The spelling of 71162780069 in words is "seventy-one billion, one hundred sixty-two million, seven hundred eighty thousand, sixty-nine".