3166556512421 has 2 divisors, whose sum is σ = 3166556512422. Its totient is φ = 3166556512420.

The previous prime is 3166556512367. The next prime is 3166556512451. The reversal of 3166556512421 is 1242156556613.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2157564388225 + 1008992124196 = 1468865^2 + 1004486^2 .

It is a cyclic number.

It is not a de Polignac number, because 3166556512421 - 2²⁶ = 3166489403557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3166556512451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1583278256210 + 1583278256211.

It is an arithmetic number, because the mean of its divisors is an integer number (1583278256211).

Almost surely, 2^{3166556512421} is an apocalyptic number.

It is an amenable number.

3166556512421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3166556512421 is an equidigital number, since it uses as much as digits as its factorization.

3166556512421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296000, while the sum is 47.

The spelling of 3166556512421 in words is "three trillion, one hundred sixty-six billion, five hundred fifty-six million, five hundred twelve thousand, four hundred twenty-one".