77854044235573 has 2 divisors, whose sum is σ = 77854044235574. Its totient is φ = 77854044235572.

The previous prime is 77854044235571. The next prime is 77854044235607. The reversal of 77854044235573 is 37553244045877.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70137660281329 + 7716383954244 = 8374823^2 + 2777838^2 .

It is a cyclic number.

It is not a de Polignac number, because 77854044235573 - 2¹ = 77854044235571 is a prime.

It is a super-2 number, since 2×77854044235573² (a number of 29 digits) contains 22 as substring.

Together with 77854044235571, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77854044235571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38927022117786 + 38927022117787.

It is an arithmetic number, because the mean of its divisors is an integer number (38927022117787).

Almost surely, 2^{77854044235573} is an apocalyptic number.

It is an amenable number.

77854044235573 is a deficient number, since it is larger than the sum of its proper divisors (1).

77854044235573 is an equidigital number, since it uses as much as digits as its factorization.

77854044235573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136000, while the sum is 64.

The spelling of 77854044235573 in words is "seventy-seven trillion, eight hundred fifty-four billion, forty-four million, two hundred thirty-five thousand, five hundred seventy-three".