71541755657 has 2 divisors, whose sum is σ = 71541755658. Its totient is φ = 71541755656.

The previous prime is 71541755653. The next prime is 71541755671. The reversal of 71541755657 is 75655714517.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69251080336 + 2290675321 = 263156^2 + 47861^2 .

It is a cyclic number.

It is not a de Polignac number, because 71541755657 - 2² = 71541755653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71541755599 and 71541755608.

It is not a weakly prime, because it can be changed into another prime (71541755653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35770877828 + 35770877829.

It is an arithmetic number, because the mean of its divisors is an integer number (35770877829).

Almost surely, 2^71541755657 is an apocalyptic number.

It is an amenable number.

71541755657 is a deficient number, since it is larger than the sum of its proper divisors (1).

71541755657 is an equidigital number, since it uses as much as digits as its factorization.

71541755657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5145000, while the sum is 53.

The spelling of 71541755657 in words is "seventy-one billion, five hundred forty-one million, seven hundred fifty-five thousand, six hundred fifty-seven".