1851617630940 has 384 divisors, whose sum is σ = 6559167283200. Its totient is φ = 379097072640.

The previous prime is 1851617630911. The next prime is 1851617630957. The reversal of 1851617630940 is 490367161581.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 185769837 + ... + 185779803.

It is an arithmetic number, because the mean of its divisors is an integer number (17081164800).

Almost surely, 2^{1851617630940} is an apocalyptic number.

1851617630940 is a gapful number since it is divisible by the number (10) 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 1851617630940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3279583641600).

1851617630940 is an abundant number, since it is smaller than the sum of its proper divisors (4707549652260).

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

1851617630940 is a wasteful number, since it uses less digits than its factorization.

1851617630940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10585 (or 10583 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 1851617630940 in words is "one trillion, eight hundred fifty-one billion, six hundred seventeen million, six hundred thirty thousand, nine hundred forty".