6661134420251 has 2 divisors, whose sum is σ = 6661134420252. Its totient is φ = 6661134420250.

The previous prime is 6661134420233. The next prime is 6661134420277. The reversal of 6661134420251 is 1520244311666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6661134420251 - 2¹⁴ = 6661134403867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6661134420199 and 6661134420208.

It is not a weakly prime, because it can be changed into another prime (6661134410251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330567210125 + 3330567210126.

It is an arithmetic number, because the mean of its divisors is an integer number (3330567210126).

Almost surely, 2^{6661134420251} is an apocalyptic number.

6661134420251 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661134420251 is an equidigital number, since it uses as much as digits as its factorization.

6661134420251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 6661134420251 in words is "six trillion, six hundred sixty-one billion, one hundred thirty-four million, four hundred twenty thousand, two hundred fifty-one".