1665266537803 has 32 divisors (see below), whose sum is σ = 1902806820864. Its totient is φ = 1443657600000.

The previous prime is 1665266537783. The next prime is 1665266537821. The reversal of 1665266537803 is 3087356625661.

It is a de Polignac number, because none of the positive numbers 2^k-1665266537803 is a prime.

It is a super-2 number, since 2×1665266537803² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665266537903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7152475 + ... + 7381627.

It is an arithmetic number, because the mean of its divisors is an integer number (59462713152).

Almost surely, 2^{1665266537803} is an apocalyptic number.

1665266537803 is a deficient number, since it is larger than the sum of its proper divisors (237540283061).

1665266537803 is a wasteful number, since it uses less digits than its factorization.

1665266537803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229507.

The product of its (nonzero) digits is 32659200, while the sum is 58.

The spelling of 1665266537803 in words is "one trillion, six hundred sixty-five billion, two hundred sixty-six million, five hundred thirty-seven thousand, eight hundred three".