15109805975261 has 4 divisors (see below), whose sum is σ = 15110032206300. Its totient is φ = 15109579744224.

The previous prime is 15109805975233. The next prime is 15109805975293. The reversal of 15109805975261 is 16257950890151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7493254739161 + 7616551236100 = 2737381^2 + 2759810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15109805975261 is a prime.

It is a super-2 number, since 2×15109805975261² (a number of 27 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 15109805975261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15109805975161) 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, 113015306 + ... + 113148923.

It is an arithmetic number, because the mean of its divisors is an integer number (3777508051575).

Almost surely, 2^{15109805975261} is an apocalyptic number.

It is an amenable number.

15109805975261 is a deficient number, since it is larger than the sum of its proper divisors (226231039).

15109805975261 is an equidigital number, since it uses as much as digits as its factorization.

15109805975261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226231038.

The product of its (nonzero) digits is 6804000, while the sum is 59.

The spelling of 15109805975261 in words is "fifteen trillion, one hundred nine billion, eight hundred five million, nine hundred seventy-five thousand, two hundred sixty-one".