71778065776 has 10 divisors (see below), whose sum is σ = 139070002472. Its totient is φ = 35889032880.

The previous prime is 71778065773. The next prime is 71778065809. The reversal of 71778065776 is 67756087717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71778065773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2243064540 + ... + 2243064571.

Almost surely, 2^71778065776 is an apocalyptic number.

It is an amenable number.

71778065776 is a deficient number, since it is larger than the sum of its proper divisors (67291936696).

71778065776 is a wasteful number, since it uses less digits than its factorization.

71778065776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4486129119 (or 4486129113 counting only the distinct ones).

The product of its (nonzero) digits is 24202080, while the sum is 61.

The spelling of 71778065776 in words is "seventy-one billion, seven hundred seventy-eight million, sixty-five thousand, seven hundred seventy-six".