1662665401279 has 2 divisors, whose sum is σ = 1662665401280. Its totient is φ = 1662665401278.

The previous prime is 1662665401223. The next prime is 1662665401301. The reversal of 1662665401279 is 9721045662661.

It is a strong prime.

It is an emirp because it is prime and its reverse (9721045662661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1662665401279 - 2²⁵ = 1662631846847 is a prime.

It is a super-2 number, since 2×1662665401279² (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 (1662665431279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831332700639 + 831332700640.

It is an arithmetic number, because the mean of its divisors is an integer number (831332700640).

Almost surely, 2^{1662665401279} is an apocalyptic number.

1662665401279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662665401279 is an equidigital number, since it uses as much as digits as its factorization.

1662665401279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 1662665401279 in words is "one trillion, six hundred sixty-two billion, six hundred sixty-five million, four hundred one thousand, two hundred seventy-nine".