1661550160 has 20 divisors (see below), whose sum is σ = 3863104308. Its totient is φ = 664620032.

The previous prime is 1661550139. The next prime is 1661550161. The reversal of 1661550160 is 610551661.

It can be written as a sum of positive squares in 2 ways, for example, as 170354704 + 1491195456 = 13052^2 + 38616^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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

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 3 ways as a sum of consecutive naturals, for example, 10384609 + ... + 10384768.

Almost surely, 2^1661550160 is an apocalyptic number.

1661550160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661550160 is an abundant number, since it is smaller than the sum of its proper divisors (2201554148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661550160 is a wasteful number, since it uses less digits than its factorization.

1661550160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20769390 (or 20769384 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1661550160 is about 40762.1167261957. The cubic root of 1661550160 is about 1184.4165999595.

The spelling of 1661550160 in words is "one billion, six hundred sixty-one million, five hundred fifty thousand, one hundred sixty".