77774721139 has 8 divisors (see below), whose sum is σ = 79708124160. Its totient is φ = 75865041096.

The previous prime is 77774721137. The next prime is 77774721151. The reversal of 77774721139 is 93112747777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77774721139 - 2¹ = 77774721137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77774721139.

It is not an unprimeable number, because it can be changed into a prime (77774721137) 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 7 ways as a sum of consecutive naturals, for example, 5924107 + ... + 5937220.

It is an arithmetic number, because the mean of its divisors is an integer number (9963515520).

Almost surely, 2^77774721139 is an apocalyptic number.

77774721139 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

77774721139 is a deficient number, since it is larger than the sum of its proper divisors (1933403021).

77774721139 is a wasteful number, since it uses less digits than its factorization.

77774721139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11861489.

The product of its digits is 3630312, while the sum is 55.

The spelling of 77774721139 in words is "seventy-seven billion, seven hundred seventy-four million, seven hundred twenty-one thousand, one hundred thirty-nine".