855646487171640 has 192 divisors, whose sum is σ = 2790827403118560. Its totient is φ = 227355137694720.

The previous prime is 855646487171573. The next prime is 855646487171683. The reversal of 855646487171640 is 46171784646558.

855646487171640 is a `hidden beast` number, since 8 + 5 + 56 + 46 + 487 + 1 + 7 + 16 + 40 = 666.

It is a super-2 number, since 2×855646487171640² (a number of 31 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121926822 + ... + 128753418.

Almost surely, 2^{855646487171640} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855646487171640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1395413701559280).

855646487171640 is an abundant number, since it is smaller than the sum of its proper divisors (1935180915946920).

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

855646487171640 is a wasteful number, since it uses less digits than its factorization.

855646487171640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6827862 (or 6827855 counting only the distinct ones).

The product of its (nonzero) digits is 1083801600, while the sum is 72.

The spelling of 855646487171640 in words is "eight hundred fifty-five trillion, six hundred forty-six billion, four hundred eighty-seven million, one hundred seventy-one thousand, six hundred forty".