1601867838620 has 72 divisors (see below), whose sum is σ = 3915798001920. Its totient is φ = 548837976960.

The previous prime is 1601867838617. The next prime is 1601867838661. The reversal of 1601867838620 is 268387681061.

It is a super-2 number, since 2×1601867838620² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 885986 + ... + 1997174.

It is an arithmetic number, because the mean of its divisors is an integer number (54386083360).

Almost surely, 2^{1601867838620} is an apocalyptic number.

1601867838620 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 1601867838620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1957899000960).

1601867838620 is an abundant number, since it is smaller than the sum of its proper divisors (2313930163300).

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

1601867838620 is a wasteful number, since it uses less digits than its factorization.

1601867838620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112683 (or 1112674 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 1601867838620 in words is "one trillion, six hundred one billion, eight hundred sixty-seven million, eight hundred thirty-eight thousand, six hundred twenty".