77857488188533 has 2 divisors, whose sum is σ = 77857488188534. Its totient is φ = 77857488188532.

The previous prime is 77857488188521. The next prime is 77857488188633. The reversal of 77857488188533 is 33588188475877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77653494142884 + 203994045649 = 8812122^2 + 451657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77857488188533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77857488188633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38928744094266 + 38928744094267.

It is an arithmetic number, because the mean of its divisors is an integer number (38928744094267).

Almost surely, 2^{77857488188533} is an apocalyptic number.

It is an amenable number.

77857488188533 is a deficient number, since it is larger than the sum of its proper divisors (1).

77857488188533 is an equidigital number, since it uses as much as digits as its factorization.

77857488188533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10115481600, while the sum is 82.

The spelling of 77857488188533 in words is "seventy-seven trillion, eight hundred fifty-seven billion, four hundred eighty-eight million, one hundred eighty-eight thousand, five hundred thirty-three".