3219642655 has 4 divisors (see below), whose sum is σ = 3863571192. Its totient is φ = 2575714120.

The previous prime is 3219642583. The next prime is 3219642677. The reversal of 3219642655 is 5562469123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5562469123 = 34211 ⋅162593.

It is not a de Polignac number, because 3219642655 - 2¹¹ = 3219640607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321964261 + ... + 321964270.

It is an arithmetic number, because the mean of its divisors is an integer number (965892798).

Almost surely, 2^3219642655 is an apocalyptic number.

3219642655 is a deficient number, since it is larger than the sum of its proper divisors (643928537).

3219642655 is an equidigital number, since it uses as much as digits as its factorization.

3219642655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643928536.

The product of its digits is 388800, while the sum is 43.

The square root of 3219642655 is about 56741.8950599995. The cubic root of 3219642655 is about 1476.6216243555.

The spelling of 3219642655 in words is "three billion, two hundred nineteen million, six hundred forty-two thousand, six hundred fifty-five".