1618961568 has 72 divisors (see below), whose sum is σ = 4943629152. Its totient is φ = 462559104.

The previous prime is 1618961543. The next prime is 1618961581. The reversal of 1618961568 is 8651698161.

It is a super-2 number, since 2×1618961568² = 5242073117322037248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1618961568.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167380 + ... + 176787.

It is an arithmetic number, because the mean of its divisors is an integer number (68661516).

Almost surely, 2^1618961568 is an apocalyptic number.

It is an amenable number.

1618961568 is an abundant number, since it is smaller than the sum of its proper divisors (3324667584).

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

1618961568 is a wasteful number, since it uses less digits than its factorization.

1618961568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344194 (or 344179 counting only the distinct ones).

The product of its digits is 622080, while the sum is 51.

The square root of 1618961568 is about 40236.3215018471. The cubic root of 1618961568 is about 1174.2092927965.

The spelling of 1618961568 in words is "one billion, six hundred eighteen million, nine hundred sixty-one thousand, five hundred sixty-eight".