6411671253521 has 4 divisors (see below), whose sum is σ = 6427660459044. Its totient is φ = 6395682048000.

The previous prime is 6411671253479. The next prime is 6411671253541. The reversal of 6411671253521 is 1253521761146.

It is a happy number.

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 4455138918400 + 1956532335121 = 2110720^2 + 1398761^2 .

It is a cyclic number.

It is not a de Polignac number, because 6411671253521 - 2¹⁸ = 6411670991377 is a prime.

It is a super-2 number, since 2×6411671253521² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6411671253541) 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, 7994602160 + ... + 7994602961.

It is an arithmetic number, because the mean of its divisors is an integer number (1606915114761).

Almost surely, 2^{6411671253521} is an apocalyptic number.

It is an amenable number.

6411671253521 is a deficient number, since it is larger than the sum of its proper divisors (15989205523).

6411671253521 is a wasteful number, since it uses less digits than its factorization.

6411671253521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15989205522.

The product of its digits is 302400, while the sum is 44.

The spelling of 6411671253521 in words is "six trillion, four hundred eleven billion, six hundred seventy-one million, two hundred fifty-three thousand, five hundred twenty-one".