1661386344 has 16 divisors (see below), whose sum is σ = 4153465920. Its totient is φ = 553795440.

The previous prime is 1661386343. The next prime is 1661386357. The reversal of 1661386344 is 4436831661.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1661386296 and 1661386305.

It is not an unprimeable number, because it can be changed into a prime (1661386343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34612192 + ... + 34612239.

It is an arithmetic number, because the mean of its divisors is an integer number (259591620).

Almost surely, 2^1661386344 is an apocalyptic number.

It is an amenable number.

1661386344 is an abundant number, since it is smaller than the sum of its proper divisors (2492079576).

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

1661386344 is a wasteful number, since it uses less digits than its factorization.

1661386344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69224440 (or 69224436 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 1661386344 is about 40760.1072618805. The cubic root of 1661386344 is about 1184.3776739069.

The spelling of 1661386344 in words is "one billion, six hundred sixty-one million, three hundred eighty-six thousand, three hundred forty-four".