1645688892036 has 192 divisors, whose sum is σ = 4720685598720. Its totient is φ = 435740497920.

The previous prime is 1645688891993. The next prime is 1645688892049. The reversal of 1645688892036 is 6302988865461.

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28477291 + ... + 28535021.

It is an arithmetic number, because the mean of its divisors is an integer number (24586904160).

Almost surely, 2^{1645688892036} 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 1645688892036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2360342799360).

1645688892036 is an abundant number, since it is smaller than the sum of its proper divisors (3074996706684).

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

1645688892036 is a wasteful number, since it uses less digits than its factorization.

1645688892036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58154 (or 58152 counting only the distinct ones).

The product of its (nonzero) digits is 119439360, while the sum is 66.

The spelling of 1645688892036 in words is "one trillion, six hundred forty-five billion, six hundred eighty-eight million, eight hundred ninety-two thousand, thirty-six".