77989941895 has 4 divisors (see below), whose sum is σ = 93587930280. Its totient is φ = 62391953512.

The previous prime is 77989941871. The next prime is 77989941899. The reversal of 77989941895 is 59814998977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77989941895 - 2¹⁷ = 77989810823 is a prime.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77989941899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7798994185 + ... + 7798994194.

It is an arithmetic number, because the mean of its divisors is an integer number (23396982570).

Almost surely, 2^77989941895 is an apocalyptic number.

77989941895 is a deficient number, since it is larger than the sum of its proper divisors (15597988385).

77989941895 is a wasteful number, since it uses less digits than its factorization.

77989941895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15597988384.

The product of its digits is 411505920, while the sum is 76.

The spelling of 77989941895 in words is "seventy-seven billion, nine hundred eighty-nine million, nine hundred forty-one thousand, eight hundred ninety-five".