1801651971336 has 128 divisors (see below), whose sum is σ = 5201864478720. Its totient is φ = 509337264384.

The previous prime is 1801651971319. The next prime is 1801651971347. The reversal of 1801651971336 is 6331791561081.

It is a happy number.

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, 21120226 + ... + 21205358.

It is an arithmetic number, because the mean of its divisors is an integer number (40639566240).

Almost surely, 2^{1801651971336} 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 1801651971336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2600932239360).

1801651971336 is an abundant number, since it is smaller than the sum of its proper divisors (3400212507384).

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

1801651971336 is a wasteful number, since it uses less digits than its factorization.

1801651971336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86475 (or 86471 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 1801651971336 in words is "one trillion, eight hundred one billion, six hundred fifty-one million, nine hundred seventy-one thousand, three hundred thirty-six".