18781563090 has 16 divisors (see below), whose sum is σ = 45075751488. Its totient is φ = 5008416816.

The previous prime is 18781563049. The next prime is 18781563107. The reversal of 18781563090 is 9036518781.

It is a super-2 number, since 2×18781563090² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313026022 + ... + 313026081.

It is an arithmetic number, because the mean of its divisors is an integer number (2817234468).

Almost surely, 2^18781563090 is an apocalyptic number.

18781563090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18781563090 is an abundant number, since it is smaller than the sum of its proper divisors (26294188398).

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

18781563090 is a wasteful number, since it uses less digits than its factorization.

18781563090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626052113.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 18781563090 in words is "eighteen billion, seven hundred eighty-one million, five hundred sixty-three thousand, ninety".