1505666166481 has 2 divisors, whose sum is σ = 1505666166482. Its totient is φ = 1505666166480.

The previous prime is 1505666166479. The next prime is 1505666166539. The reversal of 1505666166481 is 1846616665051.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1310796010000 + 194870156481 = 1144900^2 + 441441^2 .

It is a cyclic number.

It is not a de Polignac number, because 1505666166481 - 2¹ = 1505666166479 is a prime.

It is a super-2 number, since 2×1505666166481² (a number of 25 digits) contains 22 as substring.

Together with 1505666166479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1505666166421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 752833083240 + 752833083241.

It is an arithmetic number, because the mean of its divisors is an integer number (752833083241).

Almost surely, 2^{1505666166481} is an apocalyptic number.

It is an amenable number.

1505666166481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1505666166481 is an equidigital number, since it uses as much as digits as its factorization.

1505666166481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 1505666166481 in words is "one trillion, five hundred five billion, six hundred sixty-six million, one hundred sixty-six thousand, four hundred eighty-one".