261138928670 has 16 divisors (see below), whose sum is σ = 470161560240. Its totient is φ = 104430796224.

The previous prime is 261138928669. The next prime is 261138928681. The reversal of 261138928670 is 76829831162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3052607 + ... + 3136986.

It is an arithmetic number, because the mean of its divisors is an integer number (29385097515).

Almost surely, 2^261138928670 is an apocalyptic number.

261138928670 is a deficient number, since it is larger than the sum of its proper divisors (209022631570).

261138928670 is a wasteful number, since it uses less digits than its factorization.

261138928670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6193819.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 261138928670 in words is "two hundred sixty-one billion, one hundred thirty-eight million, nine hundred twenty-eight thousand, six hundred seventy".