18980780544 has 640 divisors, whose sum is σ = 65712936960. Its totient is φ = 5419560960.

The previous prime is 18980780519. The next prime is 18980780563. The reversal of 18980780544 is 44508708981.

18980780544 is a `hidden beast` number, since 1 + 8 + 98 + 0 + 7 + 8 + 0 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 283295199 + ... + 283295265.

It is an arithmetic number, because the mean of its divisors is an integer number (102676464).

Almost surely, 2^18980780544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18980780544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32856468480).

18980780544 is an abundant number, since it is smaller than the sum of its proper divisors (46732156416).

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

18980780544 is an frugal number, since it uses more digits than its factorization.

18980780544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 18980780544 in words is "eighteen billion, nine hundred eighty million, seven hundred eighty thousand, five hundred forty-four".