26172726197 has 2 divisors, whose sum is σ = 26172726198. Its totient is φ = 26172726196.

The previous prime is 26172726133. The next prime is 26172726253. The reversal of 26172726197 is 79162727162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22441837636 + 3730888561 = 149806^2 + 61081^2 .

It is a cyclic number.

It is not a de Polignac number, because 26172726197 - 2⁶ = 26172726133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26172726997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13086363098 + 13086363099.

It is an arithmetic number, because the mean of its divisors is an integer number (13086363099).

Almost surely, 2^26172726197 is an apocalyptic number.

It is an amenable number.

26172726197 is a deficient number, since it is larger than the sum of its proper divisors (1).

26172726197 is an equidigital number, since it uses as much as digits as its factorization.

26172726197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 50.

The spelling of 26172726197 in words is "twenty-six billion, one hundred seventy-two million, seven hundred twenty-six thousand, one hundred ninety-seven".