6720872872381 has 2 divisors, whose sum is σ = 6720872872382. Its totient is φ = 6720872872380.

The previous prime is 6720872872339. The next prime is 6720872872423. The reversal of 6720872872381 is 1832782780276.

It is a happy number.

6720872872381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (6720872872339) and next prime (6720872872423).

It can be written as a sum of positive squares in only one way, i.e., 4115583116100 + 2605289756281 = 2028690^2 + 1614091^2 .

It is a cyclic number.

It is not a de Polignac number, because 6720872872381 - 2¹⁵ = 6720872839613 is a prime.

It is a super-2 number, since 2×6720872872381² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6720872872331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360436436190 + 3360436436191.

It is an arithmetic number, because the mean of its divisors is an integer number (3360436436191).

Almost surely, 2^{6720872872381} is an apocalyptic number.

It is an amenable number.

6720872872381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720872872381 is an equidigital number, since it uses as much as digits as its factorization.

6720872872381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25288704, while the sum is 61.

The spelling of 6720872872381 in words is "six trillion, seven hundred twenty billion, eight hundred seventy-two million, eight hundred seventy-two thousand, three hundred eighty-one".