138866320810 has 16 divisors (see below), whose sum is σ = 285667860096. Its totient is φ = 47611309968.

The previous prime is 138866320777. The next prime is 138866320823. The reversal of 138866320810 is 18023668831.

It is a super-2 number, since 2×138866320810² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991902222 + ... + 991902361.

It is an arithmetic number, because the mean of its divisors is an integer number (17854241256).

Almost surely, 2^138866320810 is an apocalyptic number.

138866320810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138866320810 is an abundant number, since it is smaller than the sum of its proper divisors (146801539286).

138866320810 is a wasteful number, since it uses less digits than its factorization.

138866320810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983804597.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 138866320810 in words is "one hundred thirty-eight billion, eight hundred sixty-six million, three hundred twenty thousand, eight hundred ten".