26204220261 has 12 divisors (see below), whose sum is σ = 38148577792. Its totient is φ = 17331924456.

The previous prime is 26204220239. The next prime is 26204220269. The reversal of 26204220261 is 16202240262.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-26204220261 is a prime.

It is a super-2 number, since 2×26204220261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26204220269) 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, 11461771 + ... + 11464056.

Almost surely, 2^26204220261 is an apocalyptic number.

It is an amenable number.

26204220261 is a deficient number, since it is larger than the sum of its proper divisors (11944357531).

26204220261 is a wasteful number, since it uses less digits than its factorization.

26204220261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22925960 (or 22925957 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The spelling of 26204220261 in words is "twenty-six billion, two hundred four million, two hundred twenty thousand, two hundred sixty-one".