261641553582 has 32 divisors (see below), whose sum is σ = 524353360032. Its totient is φ = 87035572224.

The previous prime is 261641553497. The next prime is 261641553623. The reversal of 261641553582 is 285355146162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13259988 + ... + 13279704.

It is an arithmetic number, because the mean of its divisors is an integer number (16386042501).

Almost surely, 2^261641553582 is an apocalyptic number.

261641553582 is an abundant number, since it is smaller than the sum of its proper divisors (262711806450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261641553582 is a wasteful number, since it uses less digits than its factorization.

261641553582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24132.

The product of its digits is 1728000, while the sum is 48.

The spelling of 261641553582 in words is "two hundred sixty-one billion, six hundred forty-one million, five hundred fifty-three thousand, five hundred eighty-two".