78155012297 has 2 divisors, whose sum is σ = 78155012298. Its totient is φ = 78155012296.

The previous prime is 78155012293. The next prime is 78155012359. The reversal of 78155012297 is 79221055187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73291484176 + 4863528121 = 270724^2 + 69739^2 .

It is an emirp because it is prime and its reverse (79221055187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78155012297 - 2² = 78155012293 is a prime.

It is a super-2 number, since 2×78155012297² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78155012293) 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, 39077506148 + 39077506149.

It is an arithmetic number, because the mean of its divisors is an integer number (39077506149).

Almost surely, 2^78155012297 is an apocalyptic number.

It is an amenable number.

78155012297 is a deficient number, since it is larger than the sum of its proper divisors (1).

78155012297 is an equidigital number, since it uses as much as digits as its factorization.

78155012297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 47.

The spelling of 78155012297 in words is "seventy-eight billion, one hundred fifty-five million, twelve thousand, two hundred ninety-seven".