3215355661 has 8 divisors (see below), whose sum is σ = 3729538880. Its totient is φ = 2714884128.

The previous prime is 3215355641. The next prime is 3215355667. The reversal of 3215355661 is 1665535123.

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

It is a cyclic number.

It is not a de Polignac number, because 3215355661 - 2²³ = 3206967053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3215355661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3215355667) 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, 3427416 + ... + 3428353.

It is an arithmetic number, because the mean of its divisors is an integer number (466192360).

Almost surely, 2^3215355661 is an apocalyptic number.

It is an amenable number.

3215355661 is a deficient number, since it is larger than the sum of its proper divisors (514183219).

3215355661 is an equidigital number, since it uses as much as digits as its factorization.

3215355661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6855843.

The product of its digits is 81000, while the sum is 37.

The square root of 3215355661 is about 56704.1062093390. The cubic root of 3215355661 is about 1475.9659532752.

The spelling of 3215355661 in words is "three billion, two hundred fifteen million, three hundred fifty-five thousand, six hundred sixty-one".