26691135949 has 2 divisors, whose sum is σ = 26691135950. Its totient is φ = 26691135948.

The previous prime is 26691135941. The next prime is 26691136001. The reversal of 26691135949 is 94953119662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21022100100 + 5669035849 = 144990^2 + 75293^2 .

It is a cyclic number.

It is not a de Polignac number, because 26691135949 - 2³ = 26691135941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26691135949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26691135941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13345567974 + 13345567975.

It is an arithmetic number, because the mean of its divisors is an integer number (13345567975).

Almost surely, 2^26691135949 is an apocalyptic number.

It is an amenable number.

26691135949 is a deficient number, since it is larger than the sum of its proper divisors (1).

26691135949 is an equidigital number, since it uses as much as digits as its factorization.

26691135949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 55.

The spelling of 26691135949 in words is "twenty-six billion, six hundred ninety-one million, one hundred thirty-five thousand, nine hundred forty-nine".