1662020621879 has 32 divisors (see below), whose sum is σ = 1728431738880. Its totient is φ = 1596898271232.

The previous prime is 1662020621873. The next prime is 1662020621893. The reversal of 1662020621879 is 9781260202661.

It is not a de Polignac number, because 1662020621879 - 2²⁰ = 1662019573303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662020621873) 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 in 31 ways as a sum of consecutive naturals, for example, 1034237294 + ... + 1034238900.

It is an arithmetic number, because the mean of its divisors is an integer number (54013491840).

Almost surely, 2^{1662020621879} is an apocalyptic number.

1662020621879 is a deficient number, since it is larger than the sum of its proper divisors (66411117001).

1662020621879 is a wasteful number, since it uses less digits than its factorization.

1662020621879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 1662020621879 in words is "one trillion, six hundred sixty-two billion, twenty million, six hundred twenty-one thousand, eight hundred seventy-nine".