855332551920 has 640 divisors, whose sum is σ = 3349565614080. Its totient is φ = 175390064640.

The previous prime is 855332551903. The next prime is 855332551939. The reversal of 855332551920 is 29155233558.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 855332551920.

It is a congruent number.

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, 1206392526 + ... + 1206393234.

It is an arithmetic number, because the mean of its divisors is an integer number (5233696272).

Almost surely, 2^855332551920 is an apocalyptic number.

855332551920 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 855332551920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1674782807040).

855332551920 is an abundant number, since it is smaller than the sum of its proper divisors (2494233062160).

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

855332551920 is a wasteful number, since it uses less digits than its factorization.

855332551920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 48.

The spelling of 855332551920 in words is "eight hundred fifty-five billion, three hundred thirty-two million, five hundred fifty-one thousand, nine hundred twenty".