1662020621880 has 64 divisors (see below), whose sum is σ = 5049176601600. Its totient is φ = 437595300480.

The previous prime is 1662020621873. The next prime is 1662020621893. The reversal of 1662020621880 is 881260202661.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 87649836 + ... + 87668795.

It is an arithmetic number, because the mean of its divisors is an integer number (78893384400).

Almost surely, 2^{1662020621880} is an apocalyptic number.

1662020621880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1662020621880 is an abundant number, since it is smaller than the sum of its proper divisors (3387155979720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1662020621880 is a wasteful number, since it uses less digits than its factorization.

1662020621880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175318724 (or 175318720 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 1662020621880 in words is "one trillion, six hundred sixty-two billion, twenty million, six hundred twenty-one thousand, eight hundred eighty".