683761262720021 has 4 divisors (see below), whose sum is σ = 700438366688844. Its totient is φ = 667084158751200.

The previous prime is 683761262720009. The next prime is 683761262720093. The reversal of 683761262720021 is 120027262167386.

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 413557166571025 + 270204096148996 = 20336105^2 + 16437886^2 .

It is a cyclic number.

It is not a de Polignac number, because 683761262720021 - 2¹⁴ = 683761262703637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683761262728021) 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, 8338551984350 + ... + 8338551984431.

It is an arithmetic number, because the mean of its divisors is an integer number (175109591672211).

Almost surely, 2^{683761262720021} is an apocalyptic number.

It is an amenable number.

683761262720021 is a deficient number, since it is larger than the sum of its proper divisors (16677103968823).

683761262720021 is a wasteful number, since it uses less digits than its factorization.

683761262720021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16677103968822.

The product of its (nonzero) digits is 4064256, while the sum is 53.

The spelling of 683761262720021 in words is "six hundred eighty-three trillion, seven hundred sixty-one billion, two hundred sixty-two million, seven hundred twenty thousand, twenty-one".