26100641561 has 4 divisors (see below), whose sum is σ = 26354045952. Its totient is φ = 25847237172.

The previous prime is 26100641551. The next prime is 26100641587. The reversal of 26100641561 is 16514600162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26100641561 - 2²² = 26096447257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26100641531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126702041 + ... + 126702246.

It is an arithmetic number, because the mean of its divisors is an integer number (6588511488).

Almost surely, 2^26100641561 is an apocalyptic number.

It is an amenable number.

26100641561 is a deficient number, since it is larger than the sum of its proper divisors (253404391).

26100641561 is a wasteful number, since it uses less digits than its factorization.

26100641561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253404390.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 26100641561 in words is "twenty-six billion, one hundred million, six hundred forty-one thousand, five hundred sixty-one".