1665404243436 has 12 divisors (see below), whose sum is σ = 3885943234712. Its totient is φ = 555134747808.

The previous prime is 1665404243383. The next prime is 1665404243471. The reversal of 1665404243436 is 6343424045661.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 69391843465 + ... + 69391843488.

Almost surely, 2^{1665404243436} is an apocalyptic number.

It is an amenable number.

1665404243436 is an abundant number, since it is smaller than the sum of its proper divisors (2220538991276).

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

1665404243436 is a wasteful number, since it uses less digits than its factorization.

1665404243436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138783686960 (or 138783686958 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 48.

The spelling of 1665404243436 in words is "one trillion, six hundred sixty-five billion, four hundred four million, two hundred forty-three thousand, four hundred thirty-six".