71906363576644 has 9 divisors (see below), whose sum is σ = 125836165938301. Its totient is φ = 35953173308560.

The previous prime is 71906363576633. The next prime is 71906363576647. The reversal of 71906363576644 is 44667536360917.

The square root of 71906363576644 is 8479762.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 71879230898244 + 27132678400 = 8478162^2 + 164720^2 .

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 71906363576644.

It is not an unprimeable number, because it can be changed into a prime (71906363576647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14839584 + ... + 19079464.

Almost surely, 2^{71906363576644} is an apocalyptic number.

71906363576644 is the 8479762-nd square number.

It is an amenable number.

71906363576644 is a deficient number, since it is larger than the sum of its proper divisors (53929802361657).

71906363576644 is an frugal number, since it uses more digits than its factorization.

71906363576644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8479766 (or 4239883 counting only the distinct ones).

The product of its (nonzero) digits is 411505920, while the sum is 67.

The spelling of 71906363576644 in words is "seventy-one trillion, nine hundred six billion, three hundred sixty-three million, five hundred seventy-six thousand, six hundred forty-four".