71986562897 has 8 divisors (see below), whose sum is σ = 73998376296. Its totient is φ = 69978235392.

The previous prime is 71986562867. The next prime is 71986562927. The reversal of 71986562897 is 79826568917.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (71986562867) and next prime (71986562927).

It can be written as a sum of positive squares in 4 ways, for example, as 24144187456 + 47842375441 = 155384^2 + 218729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71986562897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71986562867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 829568 + ... + 912225.

It is an arithmetic number, because the mean of its divisors is an integer number (9249797037).

Almost surely, 2^71986562897 is an apocalyptic number.

It is an amenable number.

71986562897 is a deficient number, since it is larger than the sum of its proper divisors (2011813399).

71986562897 is a wasteful number, since it uses less digits than its factorization.

71986562897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742947.

The product of its digits is 91445760, while the sum is 68.

The spelling of 71986562897 in words is "seventy-one billion, nine hundred eighty-six million, five hundred sixty-two thousand, eight hundred ninety-seven".