2002602666781 has 4 divisors (see below), whose sum is σ = 2040387622812. Its totient is φ = 1964817710752.

The previous prime is 2002602666737. The next prime is 2002602666793. The reversal of 2002602666781 is 1876662062002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1805102418681 + 197500248100 = 1343541^2 + 444410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002602666781 - 2⁷ = 2002602666653 is a prime.

It is a super-2 number, since 2×2002602666781² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002602696781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18892477936 + ... + 18892478041.

It is an arithmetic number, because the mean of its divisors is an integer number (510096905703).

Almost surely, 2^{2002602666781} is an apocalyptic number.

It is an amenable number.

2002602666781 is a deficient number, since it is larger than the sum of its proper divisors (37784956031).

2002602666781 is an equidigital number, since it uses as much as digits as its factorization.

2002602666781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37784956030.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 2002602666781 in words is "two trillion, two billion, six hundred two million, six hundred sixty-six thousand, seven hundred eighty-one".