18621836754978 has 32 divisors (see below), whose sum is σ = 38217765427776. Its totient is φ = 6045748144128.

The previous prime is 18621836754977. The next prime is 18621836755001. The reversal of 18621836754978 is 87945763812681.

It is not an unprimeable number, because it can be changed into a prime (18621836754977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102143575 + ... + 102325722.

It is an arithmetic number, because the mean of its divisors is an integer number (1194305169618).

Almost surely, 2^{18621836754978} is an apocalyptic number.

18621836754978 is an abundant number, since it is smaller than the sum of its proper divisors (19595928672798).

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

18621836754978 is a wasteful number, since it uses less digits than its factorization.

18621836754978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204469698.

The product of its digits is 975421440, while the sum is 75.

The spelling of 18621836754978 in words is "eighteen trillion, six hundred twenty-one billion, eight hundred thirty-six million, seven hundred fifty-four thousand, nine hundred seventy-eight".