261442210366 has 8 divisors (see below), whose sum is σ = 397535415984. Its totient is φ = 128930405040.

The previous prime is 261442210349. The next prime is 261442210399. The reversal of 261442210366 is 663012244162.

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

It is a super-2 number, since 2×261442210366² (a number of 24 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 895349890 + ... + 895350181.

It is an arithmetic number, because the mean of its divisors is an integer number (49691926998).

Almost surely, 2^261442210366 is an apocalyptic number.

261442210366 is a deficient number, since it is larger than the sum of its proper divisors (136093205618).

261442210366 is a wasteful number, since it uses less digits than its factorization.

261442210366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790700146.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 261442210366 in words is "two hundred sixty-one billion, four hundred forty-two million, two hundred ten thousand, three hundred sixty-six".