71866379528 has 8 divisors (see below), whose sum is σ = 134749461630. Its totient is φ = 35933189760.

The previous prime is 71866379521. The next prime is 71866379561. The reversal of 71866379528 is 82597366817.

It can be written as a sum of positive squares in only one way, i.e., 39250741924 + 32615637604 = 198118^2 + 180598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (71866379521) 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 as a sum of consecutive naturals, namely, 4491648713 + ... + 4491648728.

Almost surely, 2^71866379528 is an apocalyptic number.

It is an amenable number.

71866379528 is a deficient number, since it is larger than the sum of its proper divisors (62883082102).

71866379528 is a wasteful number, since it uses less digits than its factorization.

71866379528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8983297447 (or 8983297443 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 62.

The spelling of 71866379528 in words is "seventy-one billion, eight hundred sixty-six million, three hundred seventy-nine thousand, five hundred twenty-eight".