1662891640129 has 4 divisors (see below), whose sum is σ = 1668308225584. Its totient is φ = 1657475054676.

The previous prime is 1662891640061. The next prime is 1662891640133. The reversal of 1662891640129 is 9210461982661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1662891640129 - 2¹⁹ = 1662891115841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1662891640129.

It is not an unprimeable number, because it can be changed into a prime (1662891640829) 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, 2708292267 + ... + 2708292880.

It is an arithmetic number, because the mean of its divisors is an integer number (417077056396).

Almost surely, 2^{1662891640129} is an apocalyptic number.

It is an amenable number.

1662891640129 is a deficient number, since it is larger than the sum of its proper divisors (5416585455).

1662891640129 is an equidigital number, since it uses as much as digits as its factorization.

1662891640129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416585454.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 1662891640129 in words is "one trillion, six hundred sixty-two billion, eight hundred ninety-one million, six hundred forty thousand, one hundred twenty-nine".