1661140036 has 6 divisors (see below), whose sum is σ = 2906995070. Its totient is φ = 830570016.

The previous prime is 1661140027. The next prime is 1661140079. The reversal of 1661140036 is 6300411661.

It can be written as a sum of positive squares in only one way, i.e., 1656978436 + 4161600 = 40706^2 + 2040^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1661139986 and 1661140013.

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 as a sum of consecutive naturals, namely, 207642501 + ... + 207642508.

Almost surely, 2^1661140036 is an apocalyptic number.

It is an amenable number.

1661140036 is a deficient number, since it is larger than the sum of its proper divisors (1245855034).

1661140036 is a wasteful number, since it uses less digits than its factorization.

1661140036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415285013 (or 415285011 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1661140036 is about 40757.0857152471. The cubic root of 1661140036 is about 1184.3191412414.

Adding to 1661140036 its reverse (6300411661), we get a palindrome (7961551697).

The spelling of 1661140036 in words is "one billion, six hundred sixty-one million, one hundred forty thousand, thirty-six".