1661165436 has 24 divisors (see below), whose sum is σ = 4429774720. Its totient is φ = 474618672.

The previous prime is 1661165419. The next prime is 1661165491. The reversal of 1661165436 is 6345611661.

It is a super-2 number, since 2×1661165436² = 5518941211522140192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661165394 and 1661165403.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9887806 + ... + 9887973.

Almost surely, 2^1661165436 is an apocalyptic number.

It is an amenable number.

1661165436 is an abundant number, since it is smaller than the sum of its proper divisors (2768609284).

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

1661165436 is a wasteful number, since it uses less digits than its factorization.

1661165436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19775793 (or 19775791 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 1661165436 is about 40757.3973163155. The cubic root of 1661165436 is about 1184.3251775683.

The spelling of 1661165436 in words is "one billion, six hundred sixty-one million, one hundred sixty-five thousand, four hundred thirty-six".