1641643216 has 40 divisors (see below), whose sum is σ = 3514221504. Its totient is φ = 738946560.

The previous prime is 1641643177. The next prime is 1641643217. The reversal of 1641643216 is 6123461461.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641643217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124950 + ... + 137461.

Almost surely, 2^1641643216 is an apocalyptic number.

1641643216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1641643216 is an abundant number, since it is smaller than the sum of its proper divisors (1872578288).

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

1641643216 is a wasteful number, since it uses less digits than its factorization.

1641643216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262459 (or 262453 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 1641643216 is about 40517.1965466516. The cubic root of 1641643216 is about 1179.6674386008.

The spelling of 1641643216 in words is "one billion, six hundred forty-one million, six hundred forty-three thousand, two hundred sixteen".