1661265110 has 16 divisors (see below), whose sum is σ = 2991046176. Its totient is φ = 664335168.

The previous prime is 1661265097. The next prime is 1661265121. The reversal of 1661265110 is 115621661.

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, 24074 + ... + 62466.

It is an arithmetic number, because the mean of its divisors is an integer number (186940386).

Almost surely, 2^1661265110 is an apocalyptic number.

1661265110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661265110 is a deficient number, since it is larger than the sum of its proper divisors (1329781066).

1661265110 is a wasteful number, since it uses less digits than its factorization.

1661265110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42727.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1661265110 is about 40758.6200698699. The cubic root of 1661265110 is about 1184.3488645662.

Adding to 1661265110 its reverse (115621661), we get a palindrome (1776886771).

The spelling of 1661265110 in words is "one billion, six hundred sixty-one million, two hundred sixty-five thousand, one hundred ten".