1220600655 has 36 divisors (see below), whose sum is σ = 2137666440. Its totient is φ = 644299200.

The previous prime is 1220600609. The next prime is 1220600687. The reversal of 1220600655 is 5560060221.

1220600655 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 6 + 0 + 0 + 655 = 666.

It is not a de Polignac number, because 1220600655 - 2¹⁷ = 1220469583 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 457716 + ... + 460374.

Almost surely, 2^1220600655 is an apocalyptic number.

1220600655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1220600655 is a deficient number, since it is larger than the sum of its proper divisors (917065785).

1220600655 is a wasteful number, since it uses less digits than its factorization.

1220600655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872 (or 2768 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1220600655 is about 34937.0956863904. The cubic root of 1220600655 is about 1068.7050614120.

Adding to 1220600655 its reverse (5560060221), we get a palindrome (6780660876).

The spelling of 1220600655 in words is "one billion, two hundred twenty million, six hundred thousand, six hundred fifty-five".