261442210601 has 12 divisors (see below), whose sum is σ = 308836524240. Its totient is φ = 219392063280.

The previous prime is 261442210591. The next prime is 261442210613. The reversal of 261442210601 is 106012244162.

It is not a de Polignac number, because 261442210601 - 2¹⁸ = 261441948457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261442219601) 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, 70316111 + ... + 70319828.

It is an arithmetic number, because the mean of its divisors is an integer number (25736377020).

Almost surely, 2^261442210601 is an apocalyptic number.

It is an amenable number.

261442210601 is a deficient number, since it is larger than the sum of its proper divisors (47394313639).

261442210601 is a wasteful number, since it uses less digits than its factorization.

261442210601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140635976 (or 140635963 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 261442210601 its reverse (106012244162), we get a palindrome (367454454763).

The spelling of 261442210601 in words is "two hundred sixty-one billion, four hundred forty-two million, two hundred ten thousand, six hundred one".