1662255302381 has 2 divisors, whose sum is σ = 1662255302382. Its totient is φ = 1662255302380.

The previous prime is 1662255302377. The next prime is 1662255302399. The reversal of 1662255302381 is 1832035522661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1402827048100 + 259428254281 = 1184410^2 + 509341^2 .

It is an emirp because it is prime and its reverse (1832035522661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1662255302381 - 2² = 1662255302377 is a prime.

It is a super-2 number, since 2×1662255302381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1662255362381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831127651190 + 831127651191.

It is an arithmetic number, because the mean of its divisors is an integer number (831127651191).

Almost surely, 2^{1662255302381} is an apocalyptic number.

It is an amenable number.

1662255302381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662255302381 is an equidigital number, since it uses as much as digits as its factorization.

1662255302381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 1662255302381 in words is "one trillion, six hundred sixty-two billion, two hundred fifty-five million, three hundred two thousand, three hundred eighty-one".