261103662 has 80 divisors (see below), whose sum is σ = 631184400. Its totient is φ = 80403840.

The previous prime is 261103657. The next prime is 261103673. The reversal of 261103662 is 266301162.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 125164 + ... + 127232.

It is an arithmetic number, because the mean of its divisors is an integer number (7889805).

Almost surely, 2^261103662 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261103662, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315592200).

261103662 is an abundant number, since it is smaller than the sum of its proper divisors (370080738).

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

261103662 is a wasteful number, since it uses less digits than its factorization.

261103662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143 (or 2134 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 261103662 is about 16158.7023612665. The cubic root of 261103662 is about 639.1522483220.

The spelling of 261103662 in words is "two hundred sixty-one million, one hundred three thousand, six hundred sixty-two".