780216664500 has 960 divisors, whose sum is σ = 3234422231040. Its totient is φ = 159283584000.

The previous prime is 780216664483. The next prime is 780216664501. The reversal of 780216664500 is 5466612087.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780216664501) by changing a digit.

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 319 ways as a sum of consecutive naturals, for example, 114247086 + ... + 114253914.

It is an arithmetic number, because the mean of its divisors is an integer number (3369189824).

Almost surely, 2^780216664500 is an apocalyptic number.

780216664500 is a gapful number since it is divisible by the number (70) 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 780216664500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1617211115520).

780216664500 is an abundant number, since it is smaller than the sum of its proper divisors (2454205566540).

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

780216664500 is a wasteful number, since it uses less digits than its factorization.

780216664500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911 (or 6890 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 780216664500 in words is "seven hundred eighty billion, two hundred sixteen million, six hundred sixty-four thousand, five hundred".