1661166050 has 24 divisors (see below), whose sum is σ = 3271521636. Its totient is φ = 625379840.

The previous prime is 1661166049. The next prime is 1661166071. The reversal of 1661166050 is 506611661.

It can be written as a sum of positive squares in 6 ways, for example, as 1379899609 + 281266441 = 37147^2 + 16771^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1661165998 and 1661166016.

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 11 ways as a sum of consecutive naturals, for example, 976307 + ... + 978006.

Almost surely, 2^1661166050 is an apocalyptic number.

1661166050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661166050 is a deficient number, since it is larger than the sum of its proper divisors (1610355586).

1661166050 is a wasteful number, since it uses less digits than its factorization.

1661166050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954342 (or 1954337 counting only the distinct ones).

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

The square root of 1661166050 is about 40757.4048486898. The cubic root of 1661166050 is about 1184.3253234850.

The spelling of 1661166050 in words is "one billion, six hundred sixty-one million, one hundred sixty-six thousand, fifty".