261121020121162 has 4 divisors (see below), whose sum is σ = 391681530181746. Its totient is φ = 130560510060580.

The previous prime is 261121020121141. The next prime is 261121020121187.

261121020121162 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 256454249327721 + 4666770793441 = 16014189^2 + 2160271^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261121020121162.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65280255030289 + ... + 65280255030292.

Almost surely, 2^{261121020121162} is an apocalyptic number.

261121020121162 is a deficient number, since it is larger than the sum of its proper divisors (130560510060584).

261121020121162 is a wasteful number, since it uses less digits than its factorization.

261121020121162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130560510060583.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 261121020121162 in words is "two hundred sixty-one trillion, one hundred twenty-one billion, twenty million, one hundred twenty-one thousand, one hundred sixty-two".