2001165436 has 24 divisors (see below), whose sum is σ = 3579125760. Its totient is φ = 978588912.

The previous prime is 2001165391. The next prime is 2001165437. The reversal of 2001165436 is 6345611002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001165437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339805 + ... + 345643.

It is an arithmetic number, because the mean of its divisors is an integer number (149130240).

Almost surely, 2^2001165436 is an apocalyptic number.

It is an amenable number.

2001165436 is a deficient number, since it is larger than the sum of its proper divisors (1577960324).

2001165436 is a wasteful number, since it uses less digits than its factorization.

2001165436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7713 (or 7711 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2001165436 is about 44734.3876229462. The cubic root of 2001165436 is about 1260.1657285996.

Adding to 2001165436 its reverse (6345611002), we get a palindrome (8346776438).

The spelling of 2001165436 in words is "two billion, one million, one hundred sixty-five thousand, four hundred thirty-six".