261503042012 has 6 divisors (see below), whose sum is σ = 457630323528. Its totient is φ = 130751521004.

The previous prime is 261503041997. The next prime is 261503042023. The reversal of 261503042012 is 210240305162.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32687880248 + ... + 32687880255.

It is an arithmetic number, because the mean of its divisors is an integer number (76271720588).

Almost surely, 2^261503042012 is an apocalyptic number.

It is an amenable number.

261503042012 is a deficient number, since it is larger than the sum of its proper divisors (196127281516).

261503042012 is a wasteful number, since it uses less digits than its factorization.

261503042012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65375760507 (or 65375760505 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 261503042012 its reverse (210240305162), we get a palindrome (471743347174).

The spelling of 261503042012 in words is "two hundred sixty-one billion, five hundred three million, forty-two thousand, twelve".