1685587653768 has 128 divisors (see below), whose sum is σ = 4526036208000. Its totient is φ = 521525329920.

The previous prime is 1685587653727. The next prime is 1685587653781. The reversal of 1685587653768 is 8673567855861.

It is a super-2 number, since 2×1685587653768² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1685587653768.

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, 7030818 + ... + 7266606.

It is an arithmetic number, because the mean of its divisors is an integer number (35359657875).

Almost surely, 2^{1685587653768} 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 1685587653768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2263018104000).

1685587653768 is an abundant number, since it is smaller than the sum of its proper divisors (2840448554232).

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

1685587653768 is a wasteful number, since it uses less digits than its factorization.

1685587653768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236135 (or 236131 counting only the distinct ones).

The product of its digits is 2032128000, while the sum is 75.

The spelling of 1685587653768 in words is "one trillion, six hundred eighty-five billion, five hundred eighty-seven million, six hundred fifty-three thousand, seven hundred sixty-eight".