77887320919 has 2 divisors, whose sum is σ = 77887320920. Its totient is φ = 77887320918.

The previous prime is 77887320869. The next prime is 77887320949. The reversal of 77887320919 is 91902378877.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77887320919 is a prime.

It is a super-2 number, since 2×77887320919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77887320949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38943660459 + 38943660460.

It is an arithmetic number, because the mean of its divisors is an integer number (38943660460).

Almost surely, 2^77887320919 is an apocalyptic number.

77887320919 is a deficient number, since it is larger than the sum of its proper divisors (1).

77887320919 is an equidigital number, since it uses as much as digits as its factorization.

77887320919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10668672, while the sum is 61.

The spelling of 77887320919 in words is "seventy-seven billion, eight hundred eighty-seven million, three hundred twenty thousand, nine hundred nineteen".