71015697649 has 4 divisors (see below), whose sum is σ = 76478443636. Its totient is φ = 65552951664.

The previous prime is 71015697647. The next prime is 71015697659. The reversal of 71015697649 is 94679651017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36455028624 + 34560669025 = 190932^2 + 185905^2 .

It is a cyclic number.

It is not a de Polignac number, because 71015697649 - 2¹ = 71015697647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71015697649.

It is not an unprimeable number, because it can be changed into a prime (71015697647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2731372974 + ... + 2731372999.

It is an arithmetic number, because the mean of its divisors is an integer number (19119610909).

Almost surely, 2^71015697649 is an apocalyptic number.

It is an amenable number.

71015697649 is a deficient number, since it is larger than the sum of its proper divisors (5462745987).

71015697649 is a wasteful number, since it uses less digits than its factorization.

71015697649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5462745986.

The product of its (nonzero) digits is 2857680, while the sum is 55.

The spelling of 71015697649 in words is "seventy-one billion, fifteen million, six hundred ninety-seven thousand, six hundred forty-nine".