787851778897 has 2 divisors, whose sum is σ = 787851778898. Its totient is φ = 787851778896.

The previous prime is 787851778789. The next prime is 787851778921. The reversal of 787851778897 is 798877158787.

It is a happy number.

Together with previous prime (787851778789) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580276774081 + 207575004816 = 761759^2 + 455604^2 .

It is an emirp because it is prime and its reverse (798877158787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 787851778897 - 2²³ = 787843390289 is a prime.

It is a super-2 number, since 2×787851778897² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 787851778897.

It is not a weakly prime, because it can be changed into another prime (787851778697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 393925889448 + 393925889449.

It is an arithmetic number, because the mean of its divisors is an integer number (393925889449).

Almost surely, 2^787851778897 is an apocalyptic number.

It is an amenable number.

787851778897 is a deficient number, since it is larger than the sum of its proper divisors (1).

787851778897 is an equidigital number, since it uses as much as digits as its factorization.

787851778897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3097866240, while the sum is 82.

The spelling of 787851778897 in words is "seven hundred eighty-seven billion, eight hundred fifty-one million, seven hundred seventy-eight thousand, eight hundred ninety-seven".