1664003635051 has 4 divisors (see below), whose sum is σ = 1664009134704. Its totient is φ = 1663998135400.

The previous prime is 1664003635043. The next prime is 1664003635139. The reversal of 1664003635051 is 1505363004661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1664003635051 - 2³ = 1664003635043 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664003634995 and 1664003635013.

It is not an unprimeable number, because it can be changed into a prime (1664003335051) 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 3 ways as a sum of consecutive naturals, for example, 2267815 + ... + 2910496.

It is an arithmetic number, because the mean of its divisors is an integer number (416002283676).

Almost surely, 2^{1664003635051} is an apocalyptic number.

1664003635051 is a deficient number, since it is larger than the sum of its proper divisors (5499653).

1664003635051 is an equidigital number, since it uses as much as digits as its factorization.

1664003635051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499652.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 1664003635051 in words is "one trillion, six hundred sixty-four billion, three million, six hundred thirty-five thousand, fifty-one".