261425205634 has 8 divisors (see below), whose sum is σ = 392312954880. Its totient is φ = 130654220676.

The previous prime is 261425205623. The next prime is 261425205683. The reversal of 261425205634 is 436502524162.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29185474 + ... + 29194429.

It is an arithmetic number, because the mean of its divisors is an integer number (49039119360).

Almost surely, 2^261425205634 is an apocalyptic number.

261425205634 is a deficient number, since it is larger than the sum of its proper divisors (130887749246).

261425205634 is a wasteful number, since it uses less digits than its factorization.

261425205634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58382144.

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 261425205634 its reverse (436502524162), we get a palindrome (697927729796).

The spelling of 261425205634 in words is "two hundred sixty-one billion, four hundred twenty-five million, two hundred five thousand, six hundred thirty-four".