261534321215153 has 16 divisors (see below), whose sum is σ = 303800353378176. Its totient is φ = 220494383504640.

The previous prime is 261534321215143. The next prime is 261534321215207. The reversal of 261534321215153 is 351512123435162.

It is not a de Polignac number, because 261534321215153 - 2¹⁴ = 261534321198769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261534321215143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28323050 + ... + 36404172.

It is an arithmetic number, because the mean of its divisors is an integer number (18987522086136).

Almost surely, 2^{261534321215153} is an apocalyptic number.

It is an amenable number.

261534321215153 is a deficient number, since it is larger than the sum of its proper divisors (42266032163023).

261534321215153 is an equidigital number, since it uses as much as digits as its factorization.

261534321215153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156984.

The product of its digits is 648000, while the sum is 44.

The spelling of 261534321215153 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, three hundred twenty-one million, two hundred fifteen thousand, one hundred fifty-three".