26761520161 has 4 divisors (see below), whose sum is σ = 26901633024. Its totient is φ = 26621407300.

The previous prime is 26761520147. The next prime is 26761520183. The reversal of 26761520161 is 16102516762.

It is a happy number.

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 26761520161 - 2⁵ = 26761520129 is a prime.

It is a super-2 number, since 2×26761520161² (a number of 22 digits) contains 22 as substring.

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 26761520161.

It is not an unprimeable number, because it can be changed into a prime (26761527161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70056145 + ... + 70056526.

It is an arithmetic number, because the mean of its divisors is an integer number (6725408256).

Almost surely, 2^26761520161 is an apocalyptic number.

It is an amenable number.

26761520161 is a deficient number, since it is larger than the sum of its proper divisors (140112863).

26761520161 is a wasteful number, since it uses less digits than its factorization.

26761520161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140112862.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 26761520161 in words is "twenty-six billion, seven hundred sixty-one million, five hundred twenty thousand, one hundred sixty-one".