1663538080820 has 96 divisors (see below), whose sum is σ = 4373669744640. Its totient is φ = 516335783040.

The previous prime is 1663538080807. The next prime is 1663538080823. The reversal of 1663538080820 is 280808353661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663538080823) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1891814 + ... + 2627933.

It is an arithmetic number, because the mean of its divisors is an integer number (45559059840).

Almost surely, 2^{1663538080820} is an apocalyptic number.

1663538080820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663538080820 is an abundant number, since it is smaller than the sum of its proper divisors (2710131663820).

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

1663538080820 is a wasteful number, since it uses less digits than its factorization.

1663538080820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4520013 (or 4520011 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 1663538080820 in words is "one trillion, six hundred sixty-three billion, five hundred thirty-eight million, eighty thousand, eight hundred twenty".