18947181242896 has 15 divisors (see below), whose sum is σ = 36710197392621. Its totient is φ = 9473581915776.

The previous prime is 18947181242867. The next prime is 18947181242897. The reversal of 18947181242896 is 69824218174981.

The square root of 18947181242896 is 4352836.

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., 13301805242896 + 5645376000000 = 3647164^2 + 2376000^2 .

It is a super-2 number, since 2×18947181242896² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18947181242897) 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 2 ways as a sum of consecutive naturals, for example, 16867240 + ... + 17955448.

Almost surely, 2^{18947181242896} is an apocalyptic number.

18947181242896 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18947181242896 is the 4352836-th square number.

It is an amenable number.

18947181242896 is a deficient number, since it is larger than the sum of its proper divisors (17763016149725).

18947181242896 is an frugal number, since it uses more digits than its factorization.

18947181242896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176426 (or 1088211 counting only the distinct ones).

The product of its digits is 111476736, while the sum is 70.

The spelling of 18947181242896 in words is "eighteen trillion, nine hundred forty-seven billion, one hundred eighty-one million, two hundred forty-two thousand, eight hundred ninety-six".