13279721537 has 2 divisors, whose sum is σ = 13279721538. Its totient is φ = 13279721536.

The previous prime is 13279721449. The next prime is 13279721561. The reversal of 13279721537 is 73512797231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10485964801 + 2793756736 = 102401^2 + 52856^2 .

It is a cyclic number.

It is not a de Polignac number, because 13279721537 - 2¹⁶ = 13279656001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13279721491 and 13279721500.

It is not a weakly prime, because it can be changed into another prime (13279721437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6639860768 + 6639860769.

It is an arithmetic number, because the mean of its divisors is an integer number (6639860769).

Almost surely, 2^13279721537 is an apocalyptic number.

It is an amenable number.

13279721537 is a deficient number, since it is larger than the sum of its proper divisors (1).

13279721537 is an equidigital number, since it uses as much as digits as its factorization.

13279721537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 555660, while the sum is 47.

The spelling of 13279721537 in words is "thirteen billion, two hundred seventy-nine million, seven hundred twenty-one thousand, five hundred thirty-seven".