1646632123641 has 12 divisors (see below), whose sum is σ = 2401560552768. Its totient is φ = 1087096935384.

The previous prime is 1646632123627. The next prime is 1646632123681. The reversal of 1646632123641 is 1463212366461.

1646632123641 is a `hidden beast` number, since 1 + 6 + 4 + 6 + 632 + 1 + 2 + 3 + 6 + 4 + 1 = 666.

It is not a de Polignac number, because 1646632123641 - 2¹¹ = 1646632121593 is a prime.

It is a super-2 number, since 2×1646632123641² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1646632123681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 888150165 + ... + 888152018.

It is an arithmetic number, because the mean of its divisors is an integer number (200130046064).

Almost surely, 2^{1646632123641} is an apocalyptic number.

It is an amenable number.

1646632123641 is a deficient number, since it is larger than the sum of its proper divisors (754928429127).

1646632123641 is a wasteful number, since it uses less digits than its factorization.

1646632123641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776302292 (or 1776302289 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The spelling of 1646632123641 in words is "one trillion, six hundred forty-six billion, six hundred thirty-two million, one hundred twenty-three thousand, six hundred forty-one".