261210611012 has 24 divisors (see below), whose sum is σ = 499629028416. Its totient is φ = 118759357728.

The previous prime is 261210610987. The next prime is 261210611017. The reversal of 261210611012 is 210116012162.

It is not an unprimeable number, because it can be changed into a prime (261210611017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37483688 + ... + 37490655.

It is an arithmetic number, because the mean of its divisors is an integer number (20817876184).

Almost surely, 2^261210611012 is an apocalyptic number.

It is an amenable number.

261210611012 is a deficient number, since it is larger than the sum of its proper divisors (238418417404).

261210611012 is a wasteful number, since it uses less digits than its factorization.

261210611012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74974427 (or 74974425 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 261210611012 its reverse (210116012162), we get a palindrome (471326623174).

The spelling of 261210611012 in words is "two hundred sixty-one billion, two hundred ten million, six hundred eleven thousand, twelve".