78311334253 has 2 divisors, whose sum is σ = 78311334254. Its totient is φ = 78311334252.

The previous prime is 78311334229. The next prime is 78311334301. The reversal of 78311334253 is 35243311387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69612600964 + 8698733289 = 263842^2 + 93267^2 .

It is an emirp because it is prime and its reverse (35243311387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78311334253 - 2⁹ = 78311333741 is a prime.

It is a super-2 number, since 2×78311334253² (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 (78311331253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39155667126 + 39155667127.

It is an arithmetic number, because the mean of its divisors is an integer number (39155667127).

Almost surely, 2^78311334253 is an apocalyptic number.

It is an amenable number.

78311334253 is a deficient number, since it is larger than the sum of its proper divisors (1).

78311334253 is an equidigital number, since it uses as much as digits as its factorization.

78311334253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The spelling of 78311334253 in words is "seventy-eight billion, three hundred eleven million, three hundred thirty-four thousand, two hundred fifty-three".