1661562235 has 16 divisors (see below), whose sum is σ = 2140903872. Its totient is φ = 1233433600.

The previous prime is 1661562229. The next prime is 1661562239. The reversal of 1661562235 is 5322651661.

It is not a de Polignac number, because 1661562235 - 2¹⁹ = 1661037947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661562194 and 1661562203.

It is not an unprimeable number, because it can be changed into a prime (1661562239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131626 + ... + 143695.

It is an arithmetic number, because the mean of its divisors is an integer number (133806492).

Almost surely, 2^1661562235 is an apocalyptic number.

1661562235 is a deficient number, since it is larger than the sum of its proper divisors (479341637).

1661562235 is a wasteful number, since it uses less digits than its factorization.

1661562235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275414.

The product of its digits is 64800, while the sum is 37.

The square root of 1661562235 is about 40762.2648413947. The cubic root of 1661562235 is about 1184.4194691267.

The spelling of 1661562235 in words is "one billion, six hundred sixty-one million, five hundred sixty-two thousand, two hundred thirty-five".