779427951615121 has 2 divisors, whose sum is σ = 779427951615122. Its totient is φ = 779427951615120.

The previous prime is 779427951615041. The next prime is 779427951615143. The reversal of 779427951615121 is 121516159724977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670490949945600 + 108937001669521 = 25893840^2 + 10437289^2 .

It is an emirp because it is prime and its reverse (121516159724977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 779427951615121 - 2¹³ = 779427951606929 is a prime.

It is not a weakly prime, because it can be changed into another prime (779427951615221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389713975807560 + 389713975807561.

It is an arithmetic number, because the mean of its divisors is an integer number (389713975807561).

Almost surely, 2^{779427951615121} is an apocalyptic number.

It is an amenable number.

779427951615121 is a deficient number, since it is larger than the sum of its proper divisors (1).

779427951615121 is an equidigital number, since it uses as much as digits as its factorization.

779427951615121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66679200, while the sum is 67.

The spelling of 779427951615121 in words is "seven hundred seventy-nine trillion, four hundred twenty-seven billion, nine hundred fifty-one million, six hundred fifteen thousand, one hundred twenty-one".