1811690721632 has 72 divisors (see below), whose sum is σ = 3920953318128. Its totient is φ = 823399512320.

The previous prime is 1811690721629. The next prime is 1811690721641. The reversal of 1811690721632 is 2361270961181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41071493 + ... + 41115579.

It is an arithmetic number, because the mean of its divisors is an integer number (54457684974).

Almost surely, 2^{1811690721632} is an apocalyptic number.

It is an amenable number.

1811690721632 is an abundant number, since it is smaller than the sum of its proper divisors (2109262596496).

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

1811690721632 is a wasteful number, since it uses less digits than its factorization.

1811690721632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54732 (or 54713 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 1811690721632 in words is "one trillion, eight hundred eleven billion, six hundred ninety million, seven hundred twenty-one thousand, six hundred thirty-two".