1218772055 has 8 divisors (see below), whose sum is σ = 1475944800. Its totient is φ = 966072096.

The previous prime is 1218771989. The next prime is 1218772057. The reversal of 1218772055 is 5502778121.

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 1218772055 - 2¹² = 1218767959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218772057) 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, 1117595 + ... + 1118684.

It is an arithmetic number, because the mean of its divisors is an integer number (184493100).

Almost surely, 2^1218772055 is an apocalyptic number.

1218772055 is a deficient number, since it is larger than the sum of its proper divisors (257172745).

1218772055 is a wasteful number, since it uses less digits than its factorization.

1218772055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236393.

The product of its (nonzero) digits is 39200, while the sum is 38.

The square root of 1218772055 is about 34910.9159862642. The cubic root of 1218772055 is about 1068.1711137010.

The spelling of 1218772055 in words is "one billion, two hundred eighteen million, seven hundred seventy-two thousand, fifty-five".