328429235581 has 2 divisors, whose sum is σ = 328429235582. Its totient is φ = 328429235580.

The previous prime is 328429235573. The next prime is 328429235591. The reversal of 328429235581 is 185532924823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270331364356 + 58097871225 = 519934^2 + 241035^2 .

It is a cyclic number.

It is not a de Polignac number, because 328429235581 - 2³ = 328429235573 is a prime.

It is a super-2 number, since 2×328429235581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328429235591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164214617790 + 164214617791.

It is an arithmetic number, because the mean of its divisors is an integer number (164214617791).

Almost surely, 2^328429235581 is an apocalyptic number.

It is an amenable number.

328429235581 is a deficient number, since it is larger than the sum of its proper divisors (1).

328429235581 is an equidigital number, since it uses as much as digits as its factorization.

328429235581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 52.

The spelling of 328429235581 in words is "three hundred twenty-eight billion, four hundred twenty-nine million, two hundred thirty-five thousand, five hundred eighty-one".