261206211201 has 16 divisors (see below), whose sum is σ = 375919716480. Its totient is φ = 160376117760.

The previous prime is 261206211197. The next prime is 261206211209. The reversal of 261206211201 is 102112602162.

It is not a de Polignac number, because 261206211201 - 2² = 261206211197 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261206211209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7611120 + ... + 7645361.

It is an arithmetic number, because the mean of its divisors is an integer number (23494982280).

Almost surely, 2^261206211201 is an apocalyptic number.

It is an amenable number.

261206211201 is a deficient number, since it is larger than the sum of its proper divisors (114713505279).

261206211201 is a wasteful number, since it uses less digits than its factorization.

261206211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15256936.

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 261206211201 its reverse (102112602162), we get a palindrome (363318813363).

The spelling of 261206211201 in words is "two hundred sixty-one billion, two hundred six million, two hundred eleven thousand, two hundred one".