261123272804 has 24 divisors (see below), whose sum is σ = 463919628480. Its totient is φ = 128589153696.

The previous prime is 261123272803. The next prime is 261123272807. The reversal of 261123272804 is 408272321162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261123272801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1720322 + ... + 1865945.

It is an arithmetic number, because the mean of its divisors is an integer number (19329984520).

Almost surely, 2^261123272804 is an apocalyptic number.

It is an amenable number.

261123272804 is a deficient number, since it is larger than the sum of its proper divisors (202796355676).

261123272804 is a wasteful number, since it uses less digits than its factorization.

261123272804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586547 (or 3586545 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

Adding to 261123272804 its reverse (408272321162), we get a palindrome (669395593966).

The spelling of 261123272804 in words is "two hundred sixty-one billion, one hundred twenty-three million, two hundred seventy-two thousand, eight hundred four".