1801681266 has 64 divisors (see below), whose sum is σ = 4532391936. Its totient is φ = 463814400.

The previous prime is 1801681187. The next prime is 1801681279. The reversal of 1801681266 is 6621861081.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34951 + ... + 69461.

It is an arithmetic number, because the mean of its divisors is an integer number (70818624).

Almost surely, 2^1801681266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1801681266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2266195968).

1801681266 is an abundant number, since it is smaller than the sum of its proper divisors (2730710670).

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

1801681266 is a wasteful number, since it uses less digits than its factorization.

1801681266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34647.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1801681266 is about 42446.2161564491. The cubic root of 1801681266 is about 1216.8190145708.

The spelling of 1801681266 in words is "one billion, eight hundred one million, six hundred eighty-one thousand, two hundred sixty-six".