28355465372981 has 2 divisors, whose sum is σ = 28355465372982. Its totient is φ = 28355465372980.

The previous prime is 28355465372893. The next prime is 28355465373029. The reversal of 28355465372981 is 18927356455382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24056415610756 + 4299049762225 = 4904734^2 + 2073415^2 .

It is a cyclic number.

It is not a de Polignac number, because 28355465372981 - 2¹⁰ = 28355465371957 is a prime.

It is a super-2 number, since 2×28355465372981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28355465372081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14177732686490 + 14177732686491.

It is an arithmetic number, because the mean of its divisors is an integer number (14177732686491).

Almost surely, 2^{28355465372981} is an apocalyptic number.

It is an amenable number.

28355465372981 is a deficient number, since it is larger than the sum of its proper divisors (1).

28355465372981 is an equidigital number, since it uses as much as digits as its factorization.

28355465372981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456000, while the sum is 68.

The spelling of 28355465372981 in words is "twenty-eight trillion, three hundred fifty-five billion, four hundred sixty-five million, three hundred seventy-two thousand, nine hundred eighty-one".