1218158011 has 16 divisors (see below), whose sum is σ = 1427908608. Its totient is φ = 1017403200.

The previous prime is 1218157999. The next prime is 1218158017. The reversal of 1218158011 is 1108518121.

It is a cyclic number.

It is not a de Polignac number, because 1218158011 - 2⁵ = 1218157979 is a prime.

It is a super-2 number, since 2×1218158011² = 2967817879526952242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1218158017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282276 + ... + 286558.

It is an arithmetic number, because the mean of its divisors is an integer number (89244288).

Almost surely, 2^1218158011 is an apocalyptic number.

1218158011 is a deficient number, since it is larger than the sum of its proper divisors (209750597).

1218158011 is an equidigital number, since it uses as much as digits as its factorization.

1218158011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322.

The product of its (nonzero) digits is 640, while the sum is 28.

The square root of 1218158011 is about 34902.1204370164. The cubic root of 1218158011 is about 1067.9916942478.

The spelling of 1218158011 in words is "one billion, two hundred eighteen million, one hundred fifty-eight thousand, eleven".