320428432861 has 2 divisors, whose sum is σ = 320428432862. Its totient is φ = 320428432860.

The previous prime is 320428432823. The next prime is 320428432889. The reversal of 320428432861 is 168234824023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319304104900 + 1124327961 = 565070^2 + 33531^2 .

It is a cyclic number.

It is not a de Polignac number, because 320428432861 - 2⁷ = 320428432733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320428432561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160214216430 + 160214216431.

It is an arithmetic number, because the mean of its divisors is an integer number (160214216431).

Almost surely, 2^320428432861 is an apocalyptic number.

It is an amenable number.

320428432861 is a deficient number, since it is larger than the sum of its proper divisors (1).

320428432861 is an equidigital number, since it uses as much as digits as its factorization.

320428432861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 43.

The spelling of 320428432861 in words is "three hundred twenty billion, four hundred twenty-eight million, four hundred thirty-two thousand, eight hundred sixty-one".