261001329122 has 4 divisors (see below), whose sum is σ = 391501993686. Its totient is φ = 130500664560.

The previous prime is 261001329109. The next prime is 261001329139. The reversal of 261001329122 is 221923100162.

261001329122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 217604523361 + 43396805761 = 466481^2 + 208319^2 .

It is a super-3 number, since 3×261001329122³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65250332279 + ... + 65250332282.

Almost surely, 2^261001329122 is an apocalyptic number.

261001329122 is a deficient number, since it is larger than the sum of its proper divisors (130500664564).

261001329122 is a wasteful number, since it uses less digits than its factorization.

261001329122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130500664563.

The product of its (nonzero) digits is 2592, while the sum is 29.

Adding to 261001329122 its reverse (221923100162), we get a palindrome (482924429284).

The spelling of 261001329122 in words is "two hundred sixty-one billion, one million, three hundred twenty-nine thousand, one hundred twenty-two".