26690761945 has 4 divisors (see below), whose sum is σ = 32028914340. Its totient is φ = 21352609552.

The previous prime is 26690761931. The next prime is 26690761967. The reversal of 26690761945 is 54916709662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21040082704 + 5650679241 = 145052^2 + 75171^2 .

It is a cyclic number.

It is not a de Polignac number, because 26690761945 - 2¹⁹ = 26690237657 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2669076190 + ... + 2669076199.

It is an arithmetic number, because the mean of its divisors is an integer number (8007228585).

Almost surely, 2^26690761945 is an apocalyptic number.

It is an amenable number.

26690761945 is a deficient number, since it is larger than the sum of its proper divisors (5338152395).

26690761945 is an equidigital number, since it uses as much as digits as its factorization.

26690761945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338152394.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 26690761945 in words is "twenty-six billion, six hundred ninety million, seven hundred sixty-one thousand, nine hundred forty-five".