261237249297 has 12 divisors (see below), whose sum is σ = 377365808820. Its totient is φ = 174147497568.

The previous prime is 261237249253. The next prime is 261237249373. The reversal of 261237249297 is 792942732162.

It is a happy number.

261237249297 is a `hidden beast` number, since 2 + 61 + 2 + 3 + 7 + 2 + 492 + 97 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34760246481 + 226477002816 = 186441^2 + 475896^2 .

It is not a de Polignac number, because 261237249297 - 2⁸ = 261237249041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261237249227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 732522 + ... + 1029107.

It is an arithmetic number, because the mean of its divisors is an integer number (31447150735).

Almost surely, 2^261237249297 is an apocalyptic number.

It is an amenable number.

261237249297 is a deficient number, since it is larger than the sum of its proper divisors (116128559523).

261237249297 is a wasteful number, since it uses less digits than its factorization.

261237249297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778112 (or 1778109 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The spelling of 261237249297 in words is "two hundred sixty-one billion, two hundred thirty-seven million, two hundred forty-nine thousand, two hundred ninety-seven".