26540617005 has 144 divisors (see below), whose sum is σ = 58309467840. Its totient is φ = 11418333696.

The previous prime is 26540617003. The next prime is 26540617057. The reversal of 26540617005 is 50071604562.

It is a happy number.

It is not a de Polignac number, because 26540617005 - 2¹ = 26540617003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26540617003) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1904794 + ... + 1918676.

It is an arithmetic number, because the mean of its divisors is an integer number (404926860).

Almost surely, 2^26540617005 is an apocalyptic number.

It is an amenable number.

26540617005 is an abundant number, since it is smaller than the sum of its proper divisors (31768850835).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26540617005 is a wasteful number, since it uses less digits than its factorization.

26540617005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13945 (or 13915 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

It can be divided in two parts, 26540 and 617005, that added together give a triangular number (643545 = T₁₁₃₄).

The spelling of 26540617005 in words is "twenty-six billion, five hundred forty million, six hundred seventeen thousand, five".