1218652656 has 160 divisors (see below), whose sum is σ = 3551772672. Its totient is φ = 357488640.

The previous prime is 1218652651. The next prime is 1218652661. The reversal of 1218652656 is 6562568121.

It is an interprime number because it is at equal distance from previous prime (1218652651) and next prime (1218652661).

It is a super-2 number, since 2×1218652656² = 2970228591951708672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218652651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1411681 + ... + 1412543.

Almost surely, 2^1218652656 is an apocalyptic number.

1218652656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218652656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1775886336).

1218652656 is an abundant number, since it is smaller than the sum of its proper divisors (2333120016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218652656 is a wasteful number, since it uses less digits than its factorization.

1218652656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 985 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 1218652656 is about 34909.2058918561. The cubic root of 1218652656 is about 1068.1362308511.

The spelling of 1218652656 in words is "one billion, two hundred eighteen million, six hundred fifty-two thousand, six hundred fifty-six".