1518021648 has 200 divisors, whose sum is σ = 5162336256. Its totient is φ = 424569600.

The previous prime is 1518021619. The next prime is 1518021653. The reversal of 1518021648 is 8461208151.

1518021648 is a `hidden beast` number, since 1 + 5 + 1 + 8 + 0 + 2 + 1 + 648 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 181233 + ... + 189423.

Almost surely, 2^1518021648 is an apocalyptic number.

1518021648 is a gapful number since it is divisible by the number (18) 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 1518021648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2581168128).

1518021648 is an abundant number, since it is smaller than the sum of its proper divisors (3644314608).

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

1518021648 is a wasteful number, since it uses less digits than its factorization.

1518021648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8235 (or 8220 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1518021648 is about 38961.7972891395. The cubic root of 1518021648 is about 1149.2803684241.

Adding to 1518021648 its reverse (8461208151), we get a palindrome (9979229799).

The spelling of 1518021648 in words is "one billion, five hundred eighteen million, twenty-one thousand, six hundred forty-eight".