3216555641 has 4 divisors (see below), whose sum is σ = 3463983012. Its totient is φ = 2969128272.

The previous prime is 3216555623. The next prime is 3216555649. The reversal of 3216555641 is 1465556123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2021401600 + 1195154041 = 44960^2 + 34571^2 .

It is a cyclic number.

It is not a de Polignac number, because 3216555641 - 2²² = 3212361337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3216555595 and 3216555604.

It is not an unprimeable number, because it can be changed into a prime (3216555649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123713666 + ... + 123713691.

It is an arithmetic number, because the mean of its divisors is an integer number (865995753).

Almost surely, 2^3216555641 is an apocalyptic number.

It is an amenable number.

3216555641 is a deficient number, since it is larger than the sum of its proper divisors (247427371).

3216555641 is a wasteful number, since it uses less digits than its factorization.

3216555641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247427370.

The product of its digits is 108000, while the sum is 38.

The square root of 3216555641 is about 56714.6862902370. The cubic root of 3216555641 is about 1476.1495420210.

The spelling of 3216555641 in words is "three billion, two hundred sixteen million, five hundred fifty-five thousand, six hundred forty-one".