71973390081 has 4 divisors (see below), whose sum is σ = 95964520112. Its totient is φ = 47982260052.

The previous prime is 71973390043. The next prime is 71973390119. The reversal of 71973390081 is 18009337917.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (71973390043) and next prime (71973390119).

It is not a de Polignac number, because 71973390081 - 2⁹ = 71973389569 is a prime.

It is a super-2 number, since 2×71973390081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71973390081.

It is not an unprimeable number, because it can be changed into a prime (71973390011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11995565011 + ... + 11995565016.

It is an arithmetic number, because the mean of its divisors is an integer number (23991130028).

Almost surely, 2^71973390081 is an apocalyptic number.

It is an amenable number.

71973390081 is a deficient number, since it is larger than the sum of its proper divisors (23991130031).

71973390081 is a wasteful number, since it uses less digits than its factorization.

71973390081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23991130030.

The product of its (nonzero) digits is 285768, while the sum is 48.

The spelling of 71973390081 in words is "seventy-one billion, nine hundred seventy-three million, three hundred ninety thousand, eighty-one".