71453782557 has 8 divisors (see below), whose sum is σ = 105857455680. Its totient is φ = 47635855020.

The previous prime is 71453782553. The next prime is 71453782571. The reversal of 71453782557 is 75528735417.

71453782557 is a `hidden beast` number, since 7 + 1 + 4 + 5 + 3 + 7 + 82 + 557 = 666.

It is not a de Polignac number, because 71453782557 - 2² = 71453782553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71453782553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1323218169 + ... + 1323218222.

It is an arithmetic number, because the mean of its divisors is an integer number (13232181960).

Almost surely, 2^71453782557 is an apocalyptic number.

It is an amenable number.

71453782557 is a deficient number, since it is larger than the sum of its proper divisors (34403673123).

71453782557 is a wasteful number, since it uses less digits than its factorization.

71453782557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646436400 (or 2646436394 counting only the distinct ones).

The product of its digits is 8232000, while the sum is 54.

The spelling of 71453782557 in words is "seventy-one billion, four hundred fifty-three million, seven hundred eighty-two thousand, five hundred fifty-seven".