75671756721 has 12 divisors (see below), whose sum is σ = 119240344080. Its totient is φ = 45861670680.

The previous prime is 75671756707. The next prime is 75671756777. The reversal of 75671756721 is 12765717657.

75671756721 is a `hidden beast` number, since 7 + 5 + 6 + 71 + 7 + 567 + 2 + 1 = 666.

It is not a de Polignac number, because 75671756721 - 2⁵ = 75671756689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75671756621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 382180491 + ... + 382180688.

It is an arithmetic number, because the mean of its divisors is an integer number (9936695340).

Almost surely, 2^75671756721 is an apocalyptic number.

It is an amenable number.

75671756721 is a deficient number, since it is larger than the sum of its proper divisors (43568587359).

75671756721 is a wasteful number, since it uses less digits than its factorization.

75671756721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764361196 (or 764361193 counting only the distinct ones).

The product of its digits is 4321800, while the sum is 54.

The spelling of 75671756721 in words is "seventy-five billion, six hundred seventy-one million, seven hundred fifty-six thousand, seven hundred twenty-one".