3953216643 has 8 divisors (see below), whose sum is σ = 5337676800. Its totient is φ = 2602117128.

The previous prime is 3953216633. The next prime is 3953216731. The reversal of 3953216643 is 3466123593.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3953216643 - 2⁸ = 3953216387 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3953216595 and 3953216604.

It is not an unprimeable number, because it can be changed into a prime (3953216633) 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, 8339883 + ... + 8340356.

It is an arithmetic number, because the mean of its divisors is an integer number (667209600).

Almost surely, 2^3953216643 is an apocalyptic number.

3953216643 is a deficient number, since it is larger than the sum of its proper divisors (1384460157).

3953216643 is a wasteful number, since it uses less digits than its factorization.

3953216643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16680321.

The product of its digits is 349920, while the sum is 42.

The square root of 3953216643 is about 62874.6104799068. The cubic root of 3953216643 is about 1581.1881042539.

The spelling of 3953216643 in words is "three billion, nine hundred fifty-three million, two hundred sixteen thousand, six hundred forty-three".