261430356646 has 16 divisors (see below), whose sum is σ = 398822564880. Its totient is φ = 128489840640.

The previous prime is 261430356637. The next prime is 261430356653. The reversal of 261430356646 is 646653034162.

It is a junction number, because it is equal to n+sod(n) for n = 261430356596 and 261430356605.

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 7 ways as a sum of consecutive naturals, for example, 1607590 + ... + 1762726.

It is an arithmetic number, because the mean of its divisors is an integer number (24926410305).

Almost surely, 2^261430356646 is an apocalyptic number.

261430356646 is a deficient number, since it is larger than the sum of its proper divisors (137392208234).

261430356646 is a wasteful number, since it uses less digits than its factorization.

261430356646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169479.

The product of its (nonzero) digits is 1866240, while the sum is 46.

The spelling of 261430356646 in words is "two hundred sixty-one billion, four hundred thirty million, three hundred fifty-six thousand, six hundred forty-six".