1643616546 has 64 divisors (see below), whose sum is σ = 4065223680. Its totient is φ = 435551040.

The previous prime is 1643616529. The next prime is 1643616577. The reversal of 1643616546 is 6456163461.

It is a junction number, because it is equal to n+sod(n) for n = 1643616498 and 1643616507.

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, 34110 + ... + 66713.

It is an arithmetic number, because the mean of its divisors is an integer number (63519120).

Almost surely, 2^1643616546 is an apocalyptic number.

1643616546 is an abundant number, since it is smaller than the sum of its proper divisors (2421607134).

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

1643616546 is a wasteful number, since it uses less digits than its factorization.

1643616546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100871.

The product of its digits is 311040, while the sum is 42.

The square root of 1643616546 is about 40541.5409919258. The cubic root of 1643616546 is about 1180.1399206865.

The spelling of 1643616546 in words is "one billion, six hundred forty-three million, six hundred sixteen thousand, five hundred forty-six".