1665653640026 has 16 divisors (see below), whose sum is σ = 2643748968960. Its totient is φ = 784862968320.

The previous prime is 1665653639983. The next prime is 1665653640037. The reversal of 1665653640026 is 6200463565661.

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 7 ways as a sum of consecutive naturals, for example, 114738791 + ... + 114753306.

It is an arithmetic number, because the mean of its divisors is an integer number (165234310560).

Almost surely, 2^{1665653640026} is an apocalyptic number.

1665653640026 is a deficient number, since it is larger than the sum of its proper divisors (978095328934).

1665653640026 is a wasteful number, since it uses less digits than its factorization.

1665653640026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229492309.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 1665653640026 in words is "one trillion, six hundred sixty-five billion, six hundred fifty-three million, six hundred forty thousand, twenty-six".