261210840223 has 16 divisors (see below), whose sum is σ = 269179061760. Its totient is φ = 253319774400.

The previous prime is 261210840211. The next prime is 261210840281. The reversal of 261210840223 is 322048012162.

It is a cyclic number.

It is not a de Polignac number, because 261210840223 - 2²¹ = 261208743071 is a prime.

It is a super-2 number, since 2×261210840223² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261210840203) 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, 26202586 + ... + 26212552.

It is an arithmetic number, because the mean of its divisors is an integer number (16823691360).

Almost surely, 2^261210840223 is an apocalyptic number.

261210840223 is a deficient number, since it is larger than the sum of its proper divisors (7968221537).

261210840223 is a wasteful number, since it uses less digits than its factorization.

261210840223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13758.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 261210840223 its reverse (322048012162), we get a palindrome (583258852385).

The spelling of 261210840223 in words is "two hundred sixty-one billion, two hundred ten million, eight hundred forty thousand, two hundred twenty-three".