13028921557 has 2 divisors, whose sum is σ = 13028921558. Its totient is φ = 13028921556.

The previous prime is 13028921551. The next prime is 13028921569. The reversal of 13028921557 is 75512982031.

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., 12848449201 + 180472356 = 113351^2 + 13434^2 .

It is a cyclic number.

It is not a de Polignac number, because 13028921557 - 2¹¹ = 13028919509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13028921551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6514460778 + 6514460779.

It is an arithmetic number, because the mean of its divisors is an integer number (6514460779).

Almost surely, 2^13028921557 is an apocalyptic number.

It is an amenable number.

13028921557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13028921557 is an equidigital number, since it uses as much as digits as its factorization.

13028921557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 13028921557 in words is "thirteen billion, twenty-eight million, nine hundred twenty-one thousand, five hundred fifty-seven".