77786621081247 has 16 divisors (see below), whose sum is σ = 111708584516480. Its totient is φ = 47862272142432.

The previous prime is 77786621081243. The next prime is 77786621081311. The reversal of 77786621081247 is 74218012668777.

It is not a de Polignac number, because 77786621081247 - 2² = 77786621081243 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 (77786621081243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133408573 + ... + 133990374.

It is an arithmetic number, because the mean of its divisors is an integer number (6981786532280).

Almost surely, 2^{77786621081247} is an apocalyptic number.

77786621081247 is a deficient number, since it is larger than the sum of its proper divisors (33921963435233).

77786621081247 is a wasteful number, since it uses less digits than its factorization.

77786621081247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267406422.

The product of its (nonzero) digits is 88510464, while the sum is 66.

The spelling of 77786621081247 in words is "seventy-seven trillion, seven hundred eighty-six billion, six hundred twenty-one million, eighty-one thousand, two hundred forty-seven".