16309611780 has 648 divisors, whose sum is σ = 62111314944. Its totient is φ = 3185360640.

The previous prime is 16309611751. The next prime is 16309611797. The reversal of 16309611780 is 8711690361.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 128422077 + ... + 128422203.

Almost surely, 2^16309611780 is an apocalyptic number.

16309611780 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 16309611780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31055657472).

16309611780 is an abundant number, since it is smaller than the sum of its proper divisors (45801703164).

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

16309611780 is a wasteful number, since it uses less digits than its factorization.

16309611780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 16309611780 in words is "sixteen billion, three hundred nine million, six hundred eleven thousand, seven hundred eighty".