26645135506501 has 32 divisors (see below), whose sum is σ = 27577615968000. Its totient is φ = 25724623541760.

The previous prime is 26645135506489. The next prime is 26645135506531. The reversal of 26645135506501 is 10560553154662.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26645135506501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26645135506531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8968404946 + ... + 8968407916.

It is an arithmetic number, because the mean of its divisors is an integer number (861800499000).

Almost surely, 2^{26645135506501} is an apocalyptic number.

It is an amenable number.

26645135506501 is a deficient number, since it is larger than the sum of its proper divisors (932480461499).

26645135506501 is a wasteful number, since it uses less digits than its factorization.

26645135506501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6109.

The product of its (nonzero) digits is 3240000, while the sum is 49.

The spelling of 26645135506501 in words is "twenty-six trillion, six hundred forty-five billion, one hundred thirty-five million, five hundred six thousand, five hundred one".