261451288556 has 6 divisors (see below), whose sum is σ = 457539754980. Its totient is φ = 130725644276.

The previous prime is 261451288547. The next prime is 261451288583. The reversal of 261451288556 is 655882154162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261451288498 and 261451288507.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32681411066 + ... + 32681411073.

It is an arithmetic number, because the mean of its divisors is an integer number (76256625830).

Almost surely, 2^261451288556 is an apocalyptic number.

It is an amenable number.

261451288556 is a deficient number, since it is larger than the sum of its proper divisors (196088466424).

261451288556 is a wasteful number, since it uses less digits than its factorization.

261451288556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65362822143 (or 65362822141 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 53.

The spelling of 261451288556 in words is "two hundred sixty-one billion, four hundred fifty-one million, two hundred eighty-eight thousand, five hundred fifty-six".