71996999989 has 2 divisors, whose sum is σ = 71996999990. Its totient is φ = 71996999988.

The previous prime is 71996999969. The next prime is 71997000037. The reversal of 71996999989 is 98999969917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63126562500 + 8870437489 = 251250^2 + 94183^2 .

It is an emirp because it is prime and its reverse (98999969917) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71996999989 - 2⁵ = 71996999957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71996999969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35998499994 + 35998499995.

It is an arithmetic number, because the mean of its divisors is an integer number (35998499995).

Almost surely, 2^71996999989 is an apocalyptic number.

It is an amenable number.

71996999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71996999989 is an equidigital number, since it uses as much as digits as its factorization.

71996999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1607077584, while the sum is 85.

The spelling of 71996999989 in words is "seventy-one billion, nine hundred ninety-six million, nine hundred ninety-nine thousand, nine hundred eighty-nine".