1661550163 has 24 divisors (see below), whose sum is σ = 2087778672. Its totient is φ = 1310670144.

The previous prime is 1661550161. The next prime is 1661550169. The reversal of 1661550163 is 3610551661.

It is not a de Polignac number, because 1661550163 - 2¹ = 1661550161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661550161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217281 + ... + 224797.

It is an arithmetic number, because the mean of its divisors is an integer number (86990778).

Almost surely, 2^1661550163 is an apocalyptic number.

1661550163 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1661550163 is a deficient number, since it is larger than the sum of its proper divisors (426228509).

1661550163 is a wasteful number, since it uses less digits than its factorization.

1661550163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7891 (or 7884 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 1661550163 is about 40762.1167629945. The cubic root of 1661550163 is about 1184.4166006723.

The spelling of 1661550163 in words is "one billion, six hundred sixty-one million, five hundred fifty thousand, one hundred sixty-three".