77078087077 has 4 divisors (see below), whose sum is σ = 77841236556. Its totient is φ = 76314937600.

The previous prime is 77078087069. The next prime is 77078087161.

77078087077 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75602451681 + 1475635396 = 274959^2 + 38414^2 .

It is a cyclic number.

It is not a de Polignac number, because 77078087077 - 2³ = 77078087069 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 (77078087377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381574588 + ... + 381574789.

It is an arithmetic number, because the mean of its divisors is an integer number (19460309139).

Almost surely, 2^77078087077 is an apocalyptic number.

It is an amenable number.

77078087077 is a deficient number, since it is larger than the sum of its proper divisors (763149479).

77078087077 is a wasteful number, since it uses less digits than its factorization.

77078087077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763149478.

The product of its (nonzero) digits is 7529536, while the sum is 58.

The spelling of 77078087077 in words is "seventy-seven billion, seventy-eight million, eighty-seven thousand, seventy-seven".