26954477681 has 2 divisors, whose sum is σ = 26954477682. Its totient is φ = 26954477680.

The previous prime is 26954477651. The next prime is 26954477707. The reversal of 26954477681 is 18677445962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18771466081 + 8183011600 = 137009^2 + 90460^2 .

It is a cyclic number.

It is not a de Polignac number, because 26954477681 - 2²² = 26950283377 is a prime.

It is a super-2 number, since 2×26954477681² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 26954477681.

It is not a weakly prime, because it can be changed into another prime (26954477651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13477238840 + 13477238841.

It is an arithmetic number, because the mean of its divisors is an integer number (13477238841).

Almost surely, 2^26954477681 is an apocalyptic number.

It is an amenable number.

26954477681 is a deficient number, since it is larger than the sum of its proper divisors (1).

26954477681 is an equidigital number, since it uses as much as digits as its factorization.

26954477681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 59.

The spelling of 26954477681 in words is "twenty-six billion, nine hundred fifty-four million, four hundred seventy-seven thousand, six hundred eighty-one".