77318698356 has 18 divisors (see below), whose sum is σ = 195444487602. Its totient is φ = 25772899440.

The previous prime is 77318698343. The next prime is 77318698361. The reversal of 77318698356 is 65389681377.

It can be written as a sum of positive squares in only one way, i.e., 59956419600 + 17362278756 = 244860^2 + 131766^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×77318698356² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77318698293 and 77318698302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1073870775 + ... + 1073870846.

It is an arithmetic number, because the mean of its divisors is an integer number (10858027089).

Almost surely, 2^77318698356 is an apocalyptic number.

It is an amenable number.

77318698356 is an abundant number, since it is smaller than the sum of its proper divisors (118125789246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77318698356 is a wasteful number, since it uses less digits than its factorization.

77318698356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147741631 (or 2147741626 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The spelling of 77318698356 in words is "seventy-seven billion, three hundred eighteen million, six hundred ninety-eight thousand, three hundred fifty-six".