1643138895654 has 48 divisors (see below), whose sum is σ = 3656780972208. Its totient is φ = 532847699136.

The previous prime is 1643138895649. The next prime is 1643138895661. The reversal of 1643138895654 is 4565988313461.

It is a happy number.

1643138895654 is a `hidden beast` number, since 1 + 6 + 4 + 31 + 38 + 8 + 9 + 565 + 4 = 666.

It is a super-2 number, since 2×1643138895654² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1643138895591 and 1643138895600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5745849 + ... + 6025035.

It is an arithmetic number, because the mean of its divisors is an integer number (76182936921).

Almost surely, 2^{1643138895654} is an apocalyptic number.

1643138895654 is an abundant number, since it is smaller than the sum of its proper divisors (2013642076554).

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

1643138895654 is a wasteful number, since it uses less digits than its factorization.

1643138895654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288069 (or 288066 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 63.

The spelling of 1643138895654 in words is "one trillion, six hundred forty-three billion, one hundred thirty-eight million, eight hundred ninety-five thousand, six hundred fifty-four".