71203672081 has 8 divisors (see below), whose sum is σ = 71312685480. Its totient is φ = 71094699648.

The previous prime is 71203672031. The next prime is 71203672087. The reversal of 71203672081 is 18027630217.

It can be written as a sum of positive squares in 4 ways, for example, as 2917620225 + 68286051856 = 54015^2 + 261316^2 .

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-71203672081 is a prime.

It is a super-2 number, since 2×71203672081² (a number of 23 digits) contains 22 as substring.

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 71203672081.

It is not an unprimeable number, because it can be changed into a prime (71203672087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6102405 + ... + 6114061.

It is an arithmetic number, because the mean of its divisors is an integer number (8914085685).

Almost surely, 2^71203672081 is an apocalyptic number.

It is an amenable number.

71203672081 is a deficient number, since it is larger than the sum of its proper divisors (109013399).

71203672081 is a wasteful number, since it uses less digits than its factorization.

71203672081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20483.

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 71203672081 in words is "seventy-one billion, two hundred three million, six hundred seventy-two thousand, eighty-one".