71756493997 has 2 divisors, whose sum is σ = 71756493998. Its totient is φ = 71756493996.

The previous prime is 71756493971. The next prime is 71756494093. The reversal of 71756493997 is 79939465717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67125555396 + 4630938601 = 259086^2 + 68051^2 .

It is a cyclic number.

It is not a de Polignac number, because 71756493997 - 2⁷ = 71756493869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71756493917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35878246998 + 35878246999.

It is an arithmetic number, because the mean of its divisors is an integer number (35878246999).

Almost surely, 2^71756493997 is an apocalyptic number.

It is an amenable number.

71756493997 is a deficient number, since it is larger than the sum of its proper divisors (1).

71756493997 is an equidigital number, since it uses as much as digits as its factorization.

71756493997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90016920, while the sum is 67.

The spelling of 71756493997 in words is "seventy-one billion, seven hundred fifty-six million, four hundred ninety-three thousand, nine hundred ninety-seven".