77854171729361 has 16 divisors (see below), whose sum is σ = 79048164280320. Its totient is φ = 76662931989840.

The previous prime is 77854171729357. The next prime is 77854171729391. The reversal of 77854171729361 is 16392717145877.

It is a cyclic number.

It is not a de Polignac number, because 77854171729361 - 2² = 77854171729357 is a prime.

It is a super-2 number, since 2×77854171729361² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77854171729291 and 77854171729300.

It is not an unprimeable number, because it can be changed into a prime (77854171729351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241277750 + ... + 241600208.

It is an arithmetic number, because the mean of its divisors is an integer number (4940510267520).

Almost surely, 2^{77854171729361} is an apocalyptic number.

77854171729361 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

77854171729361 is a deficient number, since it is larger than the sum of its proper divisors (1193992550959).

77854171729361 is a wasteful number, since it uses less digits than its factorization.

77854171729361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326716.

The product of its digits is 124467840, while the sum is 68.

The spelling of 77854171729361 in words is "seventy-seven trillion, eight hundred fifty-four billion, one hundred seventy-one million, seven hundred twenty-nine thousand, three hundred sixty-one".