77687749443 has 16 divisors (see below), whose sum is σ = 105345328896. Its totient is φ = 50912027040.

The previous prime is 77687749441. The next prime is 77687749471. The reversal of 77687749443 is 34494778677.

It is not a de Polignac number, because 77687749443 - 2¹ = 77687749441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77687749441) 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, 177730 + ... + 432392.

It is an arithmetic number, because the mean of its divisors is an integer number (6584083056).

Almost surely, 2^77687749443 is an apocalyptic number.

77687749443 is a deficient number, since it is larger than the sum of its proper divisors (27657579453).

77687749443 is a wasteful number, since it uses less digits than its factorization.

77687749443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256394.

The product of its digits is 199148544, while the sum is 66.

The spelling of 77687749443 in words is "seventy-seven billion, six hundred eighty-seven million, seven hundred forty-nine thousand, four hundred forty-three".