1661051066 has 8 divisors (see below), whose sum is σ = 2492248980. Its totient is φ = 830301408.

The previous prime is 1661051047. The next prime is 1661051087. The reversal of 1661051066 is 6601501661.

It can be written as a sum of positive squares in 2 ways, for example, as 1616442025 + 44609041 = 40205^2 + 6679^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102641 + ... + 117716.

Almost surely, 2^1661051066 is an apocalyptic number.

1661051066 is a deficient number, since it is larger than the sum of its proper divisors (831197914).

1661051066 is a wasteful number, since it uses less digits than its factorization.

1661051066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224128.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1661051066 is about 40755.9942339774. The cubic root of 1661051066 is about 1184.2979969764.

It can be divided in two parts, 16610 and 51066, that added together give a palindrome (67676).

The spelling of 1661051066 in words is "one billion, six hundred sixty-one million, fifty-one thousand, sixty-six".