1661227515293 has 2 divisors, whose sum is σ = 1661227515294. Its totient is φ = 1661227515292.

The previous prime is 1661227515287. The next prime is 1661227515307. The reversal of 1661227515293 is 3925157221661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1659711736804 + 1515778489 = 1288298^2 + 38933^2 .

It is a cyclic number.

It is not a de Polignac number, because 1661227515293 - 2⁶ = 1661227515229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661227215293) 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 as a sum of consecutive naturals, namely, 830613757646 + 830613757647.

It is an arithmetic number, because the mean of its divisors is an integer number (830613757647).

Almost surely, 2^{1661227515293} is an apocalyptic number.

It is an amenable number.

1661227515293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661227515293 is an equidigital number, since it uses as much as digits as its factorization.

1661227515293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The spelling of 1661227515293 in words is "one trillion, six hundred sixty-one billion, two hundred twenty-seven million, five hundred fifteen thousand, two hundred ninety-three".