77381685273 has 4 divisors (see below), whose sum is σ = 103175580368. Its totient is φ = 51587790180.

The previous prime is 77381685253. The next prime is 77381685287. The reversal of 77381685273 is 37258618377.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77381685273 - 2¹³ = 77381677081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77381685223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12896947543 + ... + 12896947548.

It is an arithmetic number, because the mean of its divisors is an integer number (25793895092).

Almost surely, 2^77381685273 is an apocalyptic number.

It is an amenable number.

77381685273 is a deficient number, since it is larger than the sum of its proper divisors (25793895095).

77381685273 is a wasteful number, since it uses less digits than its factorization.

77381685273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25793895094.

The product of its digits is 11854080, while the sum is 57.

The spelling of 77381685273 in words is "seventy-seven billion, three hundred eighty-one million, six hundred eighty-five thousand, two hundred seventy-three".