28551681013 has 2 divisors, whose sum is σ = 28551681014. Its totient is φ = 28551681012.

The previous prime is 28551681001. The next prime is 28551681029. The reversal of 28551681013 is 31018615582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25997692644 + 2553988369 = 161238^2 + 50537^2 .

It is a cyclic number.

It is not a de Polignac number, because 28551681013 - 2⁹ = 28551680501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28551681073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14275840506 + 14275840507.

It is an arithmetic number, because the mean of its divisors is an integer number (14275840507).

Almost surely, 2^28551681013 is an apocalyptic number.

It is an amenable number.

28551681013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28551681013 is an equidigital number, since it uses as much as digits as its factorization.

28551681013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 28551681013 in words is "twenty-eight billion, five hundred fifty-one million, six hundred eighty-one thousand, thirteen".