1661051606 has 16 divisors (see below), whose sum is σ = 2639323440. Its totient is φ = 781320960.

The previous prime is 1661051537. The next prime is 1661051621. The reversal of 1661051606 is 6061501661.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 76025 + ... + 95403.

It is an arithmetic number, because the mean of its divisors is an integer number (164957715).

Almost surely, 2^1661051606 is an apocalyptic number.

1661051606 is a deficient number, since it is larger than the sum of its proper divisors (978271834).

1661051606 is a wasteful number, since it uses less digits than its factorization.

1661051606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21919.

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

The square root of 1661051606 is about 40756.0008587693. Note that the first 3 decimals coincide. The cubic root of 1661051606 is about 1184.2981253130.

The spelling of 1661051606 in words is "one billion, six hundred sixty-one million, fifty-one thousand, six hundred six".