18880191944978 has 64 divisors (see below), whose sum is σ = 36072615720960. Its totient is φ = 7209566438400.

The previous prime is 18880191944917. The next prime is 18880191945073. The reversal of 18880191944978 is 87944919108881.

It is a junction number, because it is equal to n+sod(n) for n = 18880191944899 and 18880191944908.

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 31 ways as a sum of consecutive naturals, for example, 2106503 + ... + 6495978.

It is an arithmetic number, because the mean of its divisors is an integer number (563634620640).

Almost surely, 2^{18880191944978} is an apocalyptic number.

18880191944978 is a deficient number, since it is larger than the sum of its proper divisors (17192423775982).

18880191944978 is a wasteful number, since it uses less digits than its factorization.

18880191944978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8602923.

The product of its (nonzero) digits is 334430208, while the sum is 77.

The spelling of 18880191944978 in words is "eighteen trillion, eight hundred eighty billion, one hundred ninety-one million, nine hundred forty-four thousand, nine hundred seventy-eight".