71934750721 has 4 divisors (see below), whose sum is σ = 72248876500. Its totient is φ = 71620624944.

The previous prime is 71934750703. The next prime is 71934750773. The reversal of 71934750721 is 12705743917.

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 70161414400 + 1773336321 = 264880^2 + 42111^2 .

It is a cyclic number.

It is not a de Polignac number, because 71934750721 - 2¹¹ = 71934748673 is a prime.

It is a super-2 number, since 2×71934750721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71934750781) 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, 157062546 + ... + 157063003.

It is an arithmetic number, because the mean of its divisors is an integer number (18062219125).

Almost surely, 2^71934750721 is an apocalyptic number.

It is an amenable number.

71934750721 is a deficient number, since it is larger than the sum of its proper divisors (314125779).

71934750721 is a wasteful number, since it uses less digits than its factorization.

71934750721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314125778.

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 71934750721 in words is "seventy-one billion, nine hundred thirty-four million, seven hundred fifty thousand, seven hundred twenty-one".