77546785357 has 2 divisors, whose sum is σ = 77546785358. Its totient is φ = 77546785356.

The previous prime is 77546785321. The next prime is 77546785367. The reversal of 77546785357 is 75358764577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47779839396 + 29766945961 = 218586^2 + 172531^2 .

It is an emirp because it is prime and its reverse (75358764577) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77546785357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77546785367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38773392678 + 38773392679.

It is an arithmetic number, because the mean of its divisors is an integer number (38773392679).

Almost surely, 2^77546785357 is an apocalyptic number.

It is an amenable number.

77546785357 is a deficient number, since it is larger than the sum of its proper divisors (1).

77546785357 is an equidigital number, since it uses as much as digits as its factorization.

77546785357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172872000, while the sum is 64.

The spelling of 77546785357 in words is "seventy-seven billion, five hundred forty-six million, seven hundred eighty-five thousand, three hundred fifty-seven".