6661654404131 has 4 divisors (see below), whose sum is σ = 6661669094064. Its totient is φ = 6661639714200.

The previous prime is 6661654404113. The next prime is 6661654404187. The reversal of 6661654404131 is 1314044561666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6661654404131 - 2²² = 6661650209827 is a prime.

It is a super-2 number, since 2×6661654404131² (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 (6661654404191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6642335 + ... + 7579176.

It is an arithmetic number, because the mean of its divisors is an integer number (1665417273516).

Almost surely, 2^{6661654404131} is an apocalyptic number.

6661654404131 is a deficient number, since it is larger than the sum of its proper divisors (14689933).

6661654404131 is a wasteful number, since it uses less digits than its factorization.

6661654404131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14689932.

The product of its (nonzero) digits is 1244160, while the sum is 47.

Adding to 6661654404131 its reverse (1314044561666), we get a palindrome (7975698965797).

The spelling of 6661654404131 in words is "six trillion, six hundred sixty-one billion, six hundred fifty-four million, four hundred four thousand, one hundred thirty-one".