71507858657 has 2 divisors, whose sum is σ = 71507858658. Its totient is φ = 71507858656.

The previous prime is 71507858581. The next prime is 71507858677. The reversal of 71507858657 is 75685870517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60892471696 + 10615386961 = 246764^2 + 103031^2 .

It is an emirp because it is prime and its reverse (75685870517) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71507858657 is a prime.

It is a super-2 number, since 2×71507858657² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71507858596 and 71507858605.

It is not a weakly prime, because it can be changed into another prime (71507858677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35753929328 + 35753929329.

It is an arithmetic number, because the mean of its divisors is an integer number (35753929329).

Almost surely, 2^71507858657 is an apocalyptic number.

It is an amenable number.

71507858657 is a deficient number, since it is larger than the sum of its proper divisors (1).

71507858657 is an equidigital number, since it uses as much as digits as its factorization.

71507858657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464000, while the sum is 59.

The spelling of 71507858657 in words is "seventy-one billion, five hundred seven million, eight hundred fifty-eight thousand, six hundred fifty-seven".