16611466126421 has 2 divisors, whose sum is σ = 16611466126422. Its totient is φ = 16611466126420.

The previous prime is 16611466126351. The next prime is 16611466126439. The reversal of 16611466126421 is 12462166411661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9369635292196 + 7241830834225 = 3060986^2 + 2691065^2 .

It is a cyclic number.

It is not a de Polignac number, because 16611466126421 - 2²⁶ = 16611399017557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16611466126481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305733063210 + 8305733063211.

It is an arithmetic number, because the mean of its divisors is an integer number (8305733063211).

Almost surely, 2^{16611466126421} is an apocalyptic number.

It is an amenable number.

16611466126421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16611466126421 is an equidigital number, since it uses as much as digits as its factorization.

16611466126421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 47.

The spelling of 16611466126421 in words is "sixteen trillion, six hundred eleven billion, four hundred sixty-six million, one hundred twenty-six thousand, four hundred twenty-one".