1661275082 has 4 divisors (see below), whose sum is σ = 2491912626. Its totient is φ = 830637540.

The previous prime is 1661275043. The next prime is 1661275093. The reversal of 1661275082 is 2805721661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2805721661 = 4391 ⋅638971.

It can be written as a sum of positive squares in only one way, i.e., 1381683241 + 279591841 = 37171^2 + 16721^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415318769 + ... + 415318772.

Almost surely, 2^1661275082 is an apocalyptic number.

1661275082 is a deficient number, since it is larger than the sum of its proper divisors (830637544).

1661275082 is an equidigital number, since it uses as much as digits as its factorization.

1661275082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830637543.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1661275082 is about 40758.7423996374. The cubic root of 1661275082 is about 1184.3512343071.

The spelling of 1661275082 in words is "one billion, six hundred sixty-one million, two hundred seventy-five thousand, eighty-two".