818897506560 has 720 divisors, whose sum is σ = 3357369878016. Its totient is φ = 186695663616.

The previous prime is 818897506501. The next prime is 818897506589. The reversal of 818897506560 is 65605798818.

818897506560 is a `hidden beast` number, since 8 + 18 + 8 + 9 + 7 + 50 + 6 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 336025662 + ... + 336028098.

Almost surely, 2^818897506560 is an apocalyptic number.

818897506560 is a gapful number since it is divisible by the number (80) 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 818897506560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1678684939008).

818897506560 is an abundant number, since it is smaller than the sum of its proper divisors (2538472371456).

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

818897506560 is a wasteful number, since it uses less digits than its factorization.

818897506560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940 (or 2917 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 63.

The spelling of 818897506560 in words is "eight hundred eighteen billion, eight hundred ninety-seven million, five hundred six thousand, five hundred sixty".