6221061655 has 4 divisors (see below), whose sum is σ = 7465273992. Its totient is φ = 4976849320.

The previous prime is 6221061647. The next prime is 6221061661. The reversal of 6221061655 is 5561601226.

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

It is not a de Polignac number, because 6221061655 - 2³ = 6221061647 is a prime.

It is a super-2 number, since 2×6221061655² = 77403216230622678050, which contains 22 as substring.

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 6221061655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622106161 + ... + 622106170.

It is an arithmetic number, because the mean of its divisors is an integer number (1866318498).

Almost surely, 2^6221061655 is an apocalyptic number.

6221061655 is a deficient number, since it is larger than the sum of its proper divisors (1244212337).

6221061655 is a wasteful number, since it uses less digits than its factorization.

6221061655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244212336.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 6221061655 is about 78873.7069941562. The cubic root of 6221061655 is about 1839.1684229662.

The spelling of 6221061655 in words is "six billion, two hundred twenty-one million, sixty-one thousand, six hundred fifty-five".