78651253081 has 2 divisors, whose sum is σ = 78651253082. Its totient is φ = 78651253080.

The previous prime is 78651253013. The next prime is 78651253129. The reversal of 78651253081 is 18035215687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57161159056 + 21490094025 = 239084^2 + 146595^2 .

It is an emirp because it is prime and its reverse (18035215687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78651253081 - 2⁹ = 78651252569 is a prime.

It is a super-2 number, since 2×78651253081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78651250081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39325626540 + 39325626541.

It is an arithmetic number, because the mean of its divisors is an integer number (39325626541).

Almost surely, 2^78651253081 is an apocalyptic number.

It is an amenable number.

78651253081 is a deficient number, since it is larger than the sum of its proper divisors (1).

78651253081 is an equidigital number, since it uses as much as digits as its factorization.

78651253081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 78651253081 in words is "seventy-eight billion, six hundred fifty-one million, two hundred fifty-three thousand, eighty-one".