26136764661 has 12 divisors (see below), whose sum is σ = 39828579872. Its totient is φ = 14934870744.

The previous prime is 26136764651. The next prime is 26136764677. The reversal of 26136764661 is 16646763162.

It is not a de Polignac number, because 26136764661 - 2²⁹ = 25599893749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26136764661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26136764651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 723220 + ... + 758498.

Almost surely, 2^26136764661 is an apocalyptic number.

26136764661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26136764661 is a deficient number, since it is larger than the sum of its proper divisors (13691815211).

26136764661 is an frugal number, since it uses more digits than its factorization.

26136764661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70568 (or 35289 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 48.

It can be divided in two parts, 261367 and 64661, that added together give a triangular number (326028 = T₈₀₇).

The spelling of 26136764661 in words is "twenty-six billion, one hundred thirty-six million, seven hundred sixty-four thousand, six hundred sixty-one".