78894897269 has 2 divisors, whose sum is σ = 78894897270. Its totient is φ = 78894897268.

The previous prime is 78894897259. The next prime is 78894897281. The reversal of 78894897269 is 96279849887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73692160369 + 5202736900 = 271463^2 + 72130^2 .

It is a cyclic number.

It is not a de Polignac number, because 78894897269 - 2¹⁶ = 78894831733 is a prime.

It is a super-2 number, since 2×78894897269² (a number of 23 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 78894897269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78894897259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39447448634 + 39447448635.

It is an arithmetic number, because the mean of its divisors is an integer number (39447448635).

Almost surely, 2^78894897269 is an apocalyptic number.

It is an amenable number.

78894897269 is a deficient number, since it is larger than the sum of its proper divisors (1).

78894897269 is an equidigital number, since it uses as much as digits as its factorization.

78894897269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 877879296, while the sum is 77.

The spelling of 78894897269 in words is "seventy-eight billion, eight hundred ninety-four million, eight hundred ninety-seven thousand, two hundred sixty-nine".