261015801010 has 8 divisors (see below), whose sum is σ = 469828441836. Its totient is φ = 104406320400.

The previous prime is 261015800987. The next prime is 261015801023. The reversal of 261015801010 is 10108510162.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 258988370281 + 2027430729 = 508909^2 + 45027^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13050790041 + ... + 13050790060.

Almost surely, 2^261015801010 is an apocalyptic number.

261015801010 is a deficient number, since it is larger than the sum of its proper divisors (208812640826).

261015801010 is a wasteful number, since it uses less digits than its factorization.

261015801010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26101580108.

The product of its (nonzero) digits is 480, while the sum is 25.

The spelling of 261015801010 in words is "two hundred sixty-one billion, fifteen million, eight hundred one thousand, ten".