261245344406 has 8 divisors (see below), whose sum is σ = 391870786080. Its totient is φ = 130621749048.

The previous prime is 261245344357. The next prime is 261245344457. The reversal of 261245344406 is 604443542162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25406 + ... + 723281.

It is an arithmetic number, because the mean of its divisors is an integer number (48983848260).

Almost surely, 2^261245344406 is an apocalyptic number.

261245344406 is a deficient number, since it is larger than the sum of its proper divisors (130625441674).

261245344406 is a wasteful number, since it uses less digits than its factorization.

261245344406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923158.

The product of its (nonzero) digits is 552960, while the sum is 41.

Adding to 261245344406 its reverse (604443542162), we get a palindrome (865688886568).

The spelling of 261245344406 in words is "two hundred sixty-one billion, two hundred forty-five million, three hundred forty-four thousand, four hundred six".