77854171729357 has 2 divisors, whose sum is σ = 77854171729358. Its totient is φ = 77854171729356.

The previous prime is 77854171729351. The next prime is 77854171729391. The reversal of 77854171729357 is 75392717145877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74319899568201 + 3534272161156 = 8620899^2 + 1879966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77854171729357 is a prime.

It is a super-2 number, since 2×77854171729357² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77854171729357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77854171729351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38927085864678 + 38927085864679.

It is an arithmetic number, because the mean of its divisors is an integer number (38927085864679).

Almost surely, 2^{77854171729357} is an apocalyptic number.

It is an amenable number.

77854171729357 is a deficient number, since it is larger than the sum of its proper divisors (1).

77854171729357 is an equidigital number, since it uses as much as digits as its factorization.

77854171729357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 726062400, while the sum is 73.

The spelling of 77854171729357 in words is "seventy-seven trillion, eight hundred fifty-four billion, one hundred seventy-one million, seven hundred twenty-nine thousand, three hundred fifty-seven".