861266020160 has 336 divisors, whose sum is σ = 2543084510976. Its totient is φ = 272035086336.

The previous prime is 861266020157. The next prime is 861266020171. The reversal of 861266020160 is 61020662168.

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, 218427149 + ... + 218431091.

Almost surely, 2^861266020160 is an apocalyptic number.

861266020160 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 861266020160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1271542255488).

861266020160 is an abundant number, since it is smaller than the sum of its proper divisors (1681818490816).

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

861266020160 is a wasteful number, since it uses less digits than its factorization.

861266020160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4570 (or 4547 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 861266020160 in words is "eight hundred sixty-one billion, two hundred sixty-six million, twenty thousand, one hundred sixty".