77810131641 has 16 divisors (see below), whose sum is σ = 113216256000. Its totient is φ = 47141871120.

The previous prime is 77810131601. The next prime is 77810131823. The reversal of 77810131641 is 14613101877.

It is not a de Polignac number, because 77810131641 - 2¹⁰ = 77810130617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77810131641.

It is not an unprimeable number, because it can be changed into a prime (77810131601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294145 + ... + 492078.

It is an arithmetic number, because the mean of its divisors is an integer number (7076016000).

Almost surely, 2^77810131641 is an apocalyptic number.

It is an amenable number.

77810131641 is a deficient number, since it is larger than the sum of its proper divisors (35406124359).

77810131641 is a wasteful number, since it uses less digits than its factorization.

77810131641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789236.

The product of its (nonzero) digits is 28224, while the sum is 39.

The spelling of 77810131641 in words is "seventy-seven billion, eight hundred ten million, one hundred thirty-one thousand, six hundred forty-one".