77326047681 has 32 divisors (see below), whose sum is σ = 105053644800. Its totient is φ = 50585472000.

The previous prime is 77326047649. The next prime is 77326047703. The reversal of 77326047681 is 18674062377.

It is a happy number.

It is not a de Polignac number, because 77326047681 - 2⁵ = 77326047649 is a prime.

It is a super-2 number, since 2×77326047681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77326047641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20948046 + ... + 20951736.

It is an arithmetic number, because the mean of its divisors is an integer number (3282926400).

Almost surely, 2^77326047681 is an apocalyptic number.

It is an amenable number.

77326047681 is a deficient number, since it is larger than the sum of its proper divisors (27727597119).

77326047681 is a wasteful number, since it uses less digits than its factorization.

77326047681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4397.

The product of its (nonzero) digits is 2370816, while the sum is 51.

The spelling of 77326047681 in words is "seventy-seven billion, three hundred twenty-six million, forty-seven thousand, six hundred eighty-one".