78850858321 has 2 divisors, whose sum is σ = 78850858322. Its totient is φ = 78850858320.

The previous prime is 78850858309. The next prime is 78850858337. The reversal of 78850858321 is 12385805887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49082187025 + 29768671296 = 221545^2 + 172536^2 .

It is a cyclic number.

It is not a de Polignac number, because 78850858321 - 2¹³ = 78850850129 is a prime.

It is not a weakly prime, because it can be changed into another prime (78850858421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39425429160 + 39425429161.

It is an arithmetic number, because the mean of its divisors is an integer number (39425429161).

Almost surely, 2^78850858321 is an apocalyptic number.

It is an amenable number.

78850858321 is a deficient number, since it is larger than the sum of its proper divisors (1).

78850858321 is an equidigital number, since it uses as much as digits as its factorization.

78850858321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4300800, while the sum is 55.

The spelling of 78850858321 in words is "seventy-eight billion, eight hundred fifty million, eight hundred fifty-eight thousand, three hundred twenty-one".