77807575913 has 2 divisors, whose sum is σ = 77807575914. Its totient is φ = 77807575912.

The previous prime is 77807575889. The next prime is 77807575957. The reversal of 77807575913 is 31957570877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46841079184 + 30966496729 = 216428^2 + 175973^2 .

It is an emirp because it is prime and its reverse (31957570877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77807575913 - 2¹² = 77807571817 is a prime.

It is not a weakly prime, because it can be changed into another prime (77807575513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38903787956 + 38903787957.

It is an arithmetic number, because the mean of its divisors is an integer number (38903787957).

Almost surely, 2^77807575913 is an apocalyptic number.

It is an amenable number.

77807575913 is a deficient number, since it is larger than the sum of its proper divisors (1).

77807575913 is an equidigital number, since it uses as much as digits as its factorization.

77807575913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12965400, while the sum is 59.

The spelling of 77807575913 in words is "seventy-seven billion, eight hundred seven million, five hundred seventy-five thousand, nine hundred thirteen".