261045142406 has 8 divisors (see below), whose sum is σ = 391602830664. Its totient is φ = 130510865520.

The previous prime is 261045142349. The next prime is 261045142411. The reversal of 261045142406 is 604241540162.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5824940 + ... + 5869583.

It is an arithmetic number, because the mean of its divisors is an integer number (48950353833).

Almost surely, 2^261045142406 is an apocalyptic number.

261045142406 is a deficient number, since it is larger than the sum of its proper divisors (130557688258).

261045142406 is a wasteful number, since it uses less digits than its factorization.

261045142406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11705686.

The product of its (nonzero) digits is 46080, while the sum is 35.

Adding to 261045142406 its reverse (604241540162), we get a palindrome (865286682568).

The spelling of 261045142406 in words is "two hundred sixty-one billion, forty-five million, one hundred forty-two thousand, four hundred six".