26431603993 has 2 divisors, whose sum is σ = 26431603994. Its totient is φ = 26431603992.

The previous prime is 26431603987. The next prime is 26431604027. The reversal of 26431603993 is 39930613462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14246093449 + 12185510544 = 119357^2 + 110388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26431603993 is a prime.

It is not a weakly prime, because it can be changed into another prime (26431603193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13215801996 + 13215801997.

It is an arithmetic number, because the mean of its divisors is an integer number (13215801997).

Almost surely, 2^26431603993 is an apocalyptic number.

It is an amenable number.

26431603993 is a deficient number, since it is larger than the sum of its proper divisors (1).

26431603993 is an equidigital number, since it uses as much as digits as its factorization.

26431603993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 46.

The spelling of 26431603993 in words is "twenty-six billion, four hundred thirty-one million, six hundred three thousand, nine hundred ninety-three".