109218157780 has 48 divisors (see below), whose sum is σ = 236943899136. Its totient is φ = 42244583040.

The previous prime is 109218157753. The next prime is 109218157781. The reversal of 109218157780 is 87751812901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109218157781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 722767 + ... + 860713.

It is an arithmetic number, because the mean of its divisors is an integer number (4936331232).

Almost surely, 2^109218157780 is an apocalyptic number.

109218157780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 109218157780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118471949568).

109218157780 is an abundant number, since it is smaller than the sum of its proper divisors (127725741356).

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

109218157780 is a wasteful number, since it uses less digits than its factorization.

109218157780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139264 (or 139262 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 49.

The spelling of 109218157780 in words is "one hundred nine billion, two hundred eighteen million, one hundred fifty-seven thousand, seven hundred eighty".