76660443991 has 4 divisors (see below), whose sum is σ = 76662076000. Its totient is φ = 76658811984.

The previous prime is 76660443953. The next prime is 76660444027. The reversal of 76660443991 is 19934406667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19934406667 = 7 ⋅2847772381.

It is a cyclic number.

It is not a de Polignac number, because 76660443991 - 2¹⁷ = 76660312919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76660443931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743391 + ... + 840208.

It is an arithmetic number, because the mean of its divisors is an integer number (19165519000).

Almost surely, 2^76660443991 is an apocalyptic number.

76660443991 is a deficient number, since it is larger than the sum of its proper divisors (1632009).

76660443991 is a wasteful number, since it uses less digits than its factorization.

76660443991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632008.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The spelling of 76660443991 in words is "seventy-six billion, six hundred sixty million, four hundred forty-three thousand, nine hundred ninety-one".