261570443107 has 4 divisors (see below), whose sum is σ = 261571579776. Its totient is φ = 261569306440.

The previous prime is 261570443081. The next prime is 261570443143. The reversal of 261570443107 is 701344075162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 701344075162 = 2 ⋅350672037581.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261570443107 is a prime.

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 261570443107.

It is not an unprimeable number, because it can be changed into a prime (261579443107) 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, 87619 + ... + 728572.

It is an arithmetic number, because the mean of its divisors is an integer number (65392894944).

Almost surely, 2^261570443107 is an apocalyptic number.

261570443107 is a deficient number, since it is larger than the sum of its proper divisors (1136669).

261570443107 is an equidigital number, since it uses as much as digits as its factorization.

261570443107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136668.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 261570443107 in words is "two hundred sixty-one billion, five hundred seventy million, four hundred forty-three thousand, one hundred seven".