671053320405 has 48 divisors (see below), whose sum is σ = 1273167897456. Its totient is φ = 324948879360.

The previous prime is 671053320391. The next prime is 671053320419. The reversal of 671053320405 is 504023350176.

671053320405 is a `hidden beast` number, since 67 + 1 + 0 + 533 + 20 + 40 + 5 = 666.

671053320405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (671053320391) and next prime (671053320419).

It can be written as a sum of positive squares in 8 ways, for example, as 136291657329 + 534761663076 = 369177^2 + 731274^2 .

It is not a de Polignac number, because 671053320405 - 2⁷ = 671053320277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671053320405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9366772 + ... + 9438141.

It is an arithmetic number, because the mean of its divisors is an integer number (26524331197).

Almost surely, 2^671053320405 is an apocalyptic number.

671053320405 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

671053320405 is a deficient number, since it is larger than the sum of its proper divisors (602114577051).

671053320405 is a wasteful number, since it uses less digits than its factorization.

671053320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18804998 (or 18804995 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The spelling of 671053320405 in words is "six hundred seventy-one billion, fifty-three million, three hundred twenty thousand, four hundred five".