77685698144136 has 128 divisors (see below), whose sum is σ = 205773824563200. Its totient is φ = 24402117841920.

The previous prime is 77685698144111. The next prime is 77685698144143. The reversal of 77685698144136 is 63144189658677.

It is a super-4 number, since 4×77685698144136⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1532550 + ... + 12558666.

It is an arithmetic number, because the mean of its divisors is an integer number (1607608004400).

Almost surely, 2^{77685698144136} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77685698144136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102886912281600).

77685698144136 is an abundant number, since it is smaller than the sum of its proper divisors (128088126419064).

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

77685698144136 is a wasteful number, since it uses less digits than its factorization.

77685698144136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11026399 (or 11026395 counting only the distinct ones).

The product of its digits is 1463132160, while the sum is 75.

The spelling of 77685698144136 in words is "seventy-seven trillion, six hundred eighty-five billion, six hundred ninety-eight million, one hundred forty-four thousand, one hundred thirty-six".