1988664430380 has 48 divisors (see below), whose sum is σ = 5568404674560. Its totient is φ = 530296774848.

The previous prime is 1988664430331. The next prime is 1988664430453. The reversal of 1988664430380 is 830344668891.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2021301 + ... + 2839539.

It is an arithmetic number, because the mean of its divisors is an integer number (116008430720).

Almost surely, 2^{1988664430380} is an apocalyptic number.

1988664430380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988664430380 is an abundant number, since it is smaller than the sum of its proper divisors (3579740244180).

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

1988664430380 is a wasteful number, since it uses less digits than its factorization.

1988664430380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858758 (or 858756 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 60.

The spelling of 1988664430380 in words is "one trillion, nine hundred eighty-eight billion, six hundred sixty-four million, four hundred thirty thousand, three hundred eighty".