816889056240 has 40 divisors (see below), whose sum is σ = 2532356075088. Its totient is φ = 217837081600.

The previous prime is 816889056239. The next prime is 816889056241. The reversal of 816889056240 is 42650988618.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (816889056239) and next prime (816889056241).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816889056241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1701851961 + ... + 1701852440.

Almost surely, 2^816889056240 is an apocalyptic number.

816889056240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

816889056240 is an abundant number, since it is smaller than the sum of its proper divisors (1715467018848).

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

816889056240 is a wasteful number, since it uses less digits than its factorization.

816889056240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3403704417 (or 3403704411 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 816889056240 in words is "eight hundred sixteen billion, eight hundred eighty-nine million, fifty-six thousand, two hundred forty".