77121072442387 has 2 divisors, whose sum is σ = 77121072442388. Its totient is φ = 77121072442386.

The previous prime is 77121072442331. The next prime is 77121072442397. The reversal of 77121072442387 is 78324427012177.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77121072442387 - 2¹¹ = 77121072440339 is a prime.

It is not a weakly prime, because it can be changed into another prime (77121072442397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38560536221193 + 38560536221194.

It is an arithmetic number, because the mean of its divisors is an integer number (38560536221194).

Almost surely, 2^{77121072442387} is an apocalyptic number.

77121072442387 is a deficient number, since it is larger than the sum of its proper divisors (1).

77121072442387 is an equidigital number, since it uses as much as digits as its factorization.

77121072442387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7375872, while the sum is 55.

The spelling of 77121072442387 in words is "seventy-seven trillion, one hundred twenty-one billion, seventy-two million, four hundred forty-two thousand, three hundred eighty-seven".