71577907481 has 2 divisors, whose sum is σ = 71577907482. Its totient is φ = 71577907480.

The previous prime is 71577907463. The next prime is 71577907501. The reversal of 71577907481 is 18470977517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71257497481 + 320410000 = 266941^2 + 17900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71577907481 is a prime.

It is a super-2 number, since 2×71577907481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71577907421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35788953740 + 35788953741.

It is an arithmetic number, because the mean of its divisors is an integer number (35788953741).

Almost surely, 2^71577907481 is an apocalyptic number.

It is an amenable number.

71577907481 is a deficient number, since it is larger than the sum of its proper divisors (1).

71577907481 is an equidigital number, since it uses as much as digits as its factorization.

71577907481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3457440, while the sum is 56.

The spelling of 71577907481 in words is "seventy-one billion, five hundred seventy-seven million, nine hundred seven thousand, four hundred eighty-one".