1661817042 has 12 divisors (see below), whose sum is σ = 3600603630. Its totient is φ = 553939008.

The previous prime is 1661817011. The next prime is 1661817071. The reversal of 1661817042 is 2407181661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1581732441 + 80084601 = 39771^2 + 8949^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1661816988 and 1661817006.

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 5 ways as a sum of consecutive naturals, for example, 46161567 + ... + 46161602.

Almost surely, 2^1661817042 is an apocalyptic number.

1661817042 is an abundant number, since it is smaller than the sum of its proper divisors (1938786588).

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

1661817042 is a wasteful number, since it uses less digits than its factorization.

1661817042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92323177 (or 92323174 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1661817042 is about 40765.3902471202. The cubic root of 1661817042 is about 1184.4800111354.

The spelling of 1661817042 in words is "one billion, six hundred sixty-one million, eight hundred seventeen thousand, forty-two".