673804705821 has 16 divisors (see below), whose sum is σ = 977093806080. Its totient is φ = 410543611200.

The previous prime is 673804705817. The next prime is 673804705853. The reversal of 673804705821 is 128507408376.

673804705821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 673804705821 - 2² = 673804705817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673804705891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85525981 + ... + 85533858.

It is an arithmetic number, because the mean of its divisors is an integer number (61068362880).

Almost surely, 2^673804705821 is an apocalyptic number.

It is an amenable number.

673804705821 is a deficient number, since it is larger than the sum of its proper divisors (303289100259).

673804705821 is a wasteful number, since it uses less digits than its factorization.

673804705821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171059956.

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 673804705821 in words is "six hundred seventy-three billion, eight hundred four million, seven hundred five thousand, eight hundred twenty-one".