1662665401291 has 4 divisors (see below), whose sum is σ = 1662692967000. Its totient is φ = 1662637835584.

The previous prime is 1662665401279. The next prime is 1662665401301. The reversal of 1662665401291 is 1921045662661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1662665401291 - 2⁹ = 1662665400779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662663401291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13692181 + ... + 13813078.

It is an arithmetic number, because the mean of its divisors is an integer number (415673241750).

Almost surely, 2^{1662665401291} is an apocalyptic number.

1662665401291 is a deficient number, since it is larger than the sum of its proper divisors (27565709).

1662665401291 is an equidigital number, since it uses as much as digits as its factorization.

1662665401291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27565708.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 1662665401291 in words is "one trillion, six hundred sixty-two billion, six hundred sixty-five million, four hundred one thousand, two hundred ninety-one".