18988712620816 has 15 divisors (see below), whose sum is σ = 36790664474293. Its totient is φ = 9494347595200.

The previous prime is 18988712620799. The next prime is 18988712620853. The reversal of 18988712620816 is 61802621788981.

It is a happy number.

The square root of 18988712620816 is 4357604.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13267048620816 + 5721664000000 = 3642396^2 + 2392000^2 .

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 16885716 + ... + 17975116.

Almost surely, 2^{18988712620816} is an apocalyptic number.

18988712620816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18988712620816 is the 4357604-th square number.

It is an amenable number.

18988712620816 is a deficient number, since it is larger than the sum of its proper divisors (17801951853477).

18988712620816 is an frugal number, since it uses more digits than its factorization.

18988712620816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178810 (or 1089403 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 67.

The spelling of 18988712620816 in words is "eighteen trillion, nine hundred eighty-eight billion, seven hundred twelve million, six hundred twenty thousand, eight hundred sixteen".