1361317021650 has 384 divisors, whose sum is σ = 3877466112000. Its totient is φ = 351015033600.

The previous prime is 1361317021633. The next prime is 1361317021711. The reversal of 1361317021650 is 561207131631.

1361317021650 is a `hidden beast` number, since 1 + 3 + 613 + 17 + 0 + 21 + 6 + 5 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2940209319 + ... + 2940209781.

It is an arithmetic number, because the mean of its divisors is an integer number (10097568000).

Almost surely, 2^{1361317021650} is an apocalyptic number.

1361317021650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1361317021650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1938733056000).

1361317021650 is an abundant number, since it is smaller than the sum of its proper divisors (2516149090350).

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

1361317021650 is a wasteful number, since it uses less digits than its factorization.

1361317021650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The spelling of 1361317021650 in words is "one trillion, three hundred sixty-one billion, three hundred seventeen million, twenty-one thousand, six hundred fifty".