26217921157 has 2 divisors, whose sum is σ = 26217921158. Its totient is φ = 26217921156.

The previous prime is 26217921127. The next prime is 26217921161. The reversal of 26217921157 is 75112971262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23632605441 + 2585315716 = 153729^2 + 50846^2 .

It is a cyclic number.

It is not a de Polignac number, because 26217921157 - 2²³ = 26209532549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26217921127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13108960578 + 13108960579.

It is an arithmetic number, because the mean of its divisors is an integer number (13108960579).

Almost surely, 2^26217921157 is an apocalyptic number.

It is an amenable number.

26217921157 is a deficient number, since it is larger than the sum of its proper divisors (1).

26217921157 is an equidigital number, since it uses as much as digits as its factorization.

26217921157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The spelling of 26217921157 in words is "twenty-six billion, two hundred seventeen million, nine hundred twenty-one thousand, one hundred fifty-seven".