71776680545 has 32 divisors (see below), whose sum is σ = 90676484640. Its totient is φ = 54471260160.

The previous prime is 71776680539. The next prime is 71776680557. The reversal of 71776680545 is 54508667717.

It can be written as a sum of positive squares in 16 ways, for example, as 149793121 + 71626887424 = 12239^2 + 267632^2 .

It is not a de Polignac number, because 71776680545 - 2⁴ = 71776680529 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 22063139 + ... + 22066391.

It is an arithmetic number, because the mean of its divisors is an integer number (2833640145).

Almost surely, 2^71776680545 is an apocalyptic number.

It is an amenable number.

71776680545 is a deficient number, since it is larger than the sum of its proper divisors (18899804095).

71776680545 is a wasteful number, since it uses less digits than its factorization.

71776680545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6245.

The product of its (nonzero) digits is 9878400, while the sum is 56.

The spelling of 71776680545 in words is "seventy-one billion, seven hundred seventy-six million, six hundred eighty thousand, five hundred forty-five".