78892898321 has 2 divisors, whose sum is σ = 78892898322. Its totient is φ = 78892898320.

The previous prime is 78892898269. The next prime is 78892898341. The reversal of 78892898321 is 12389829887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76764460096 + 2128438225 = 277064^2 + 46135^2 .

It is a cyclic number.

It is not a de Polignac number, because 78892898321 - 2²⁶ = 78825789457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78892898341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39446449160 + 39446449161.

It is an arithmetic number, because the mean of its divisors is an integer number (39446449161).

Almost surely, 2^78892898321 is an apocalyptic number.

It is an amenable number.

78892898321 is a deficient number, since it is larger than the sum of its proper divisors (1).

78892898321 is an equidigital number, since it uses as much as digits as its factorization.

78892898321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27869184, while the sum is 65.

The spelling of 78892898321 in words is "seventy-eight billion, eight hundred ninety-two million, eight hundred ninety-eight thousand, three hundred twenty-one".