77728487211543 has 32 divisors (see below), whose sum is σ = 122553233049600. Its totient is φ = 42875733632256.

The previous prime is 77728487211539. The next prime is 77728487211553. The reversal of 77728487211543 is 34511278482777.

It is not a de Polignac number, because 77728487211543 - 2² = 77728487211539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77728487211503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10395583 + ... + 16233456.

It is an arithmetic number, because the mean of its divisors is an integer number (3829788532800).

Almost surely, 2^{77728487211543} is an apocalyptic number.

77728487211543 is a deficient number, since it is larger than the sum of its proper divisors (44824745838057).

77728487211543 is a wasteful number, since it uses less digits than its factorization.

77728487211543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26633871.

The product of its digits is 147517440, while the sum is 66.

The spelling of 77728487211543 in words is "seventy-seven trillion, seven hundred twenty-eight billion, four hundred eighty-seven million, two hundred eleven thousand, five hundred forty-three".