881945396640 has 768 divisors, whose sum is σ = 3886740910080. Its totient is φ = 181440000000.

The previous prime is 881945396587. The next prime is 881945396663. The reversal of 881945396640 is 46693549188.

881945396640 is a `hidden beast` number, since 8 + 8 + 1 + 94 + 539 + 6 + 6 + 4 + 0 = 666.

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 127 ways as a sum of consecutive naturals, for example, 33583515 + ... + 33609765.

It is an arithmetic number, because the mean of its divisors is an integer number (5060860560).

Almost surely, 2^881945396640 is an apocalyptic number.

881945396640 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 881945396640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1943370455040).

881945396640 is an abundant number, since it is smaller than the sum of its proper divisors (3004795513440).

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

881945396640 is a wasteful number, since it uses less digits than its factorization.

881945396640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26394 (or 26380 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 881945396640 in words is "eight hundred eighty-one billion, nine hundred forty-five million, three hundred ninety-six thousand, six hundred forty".