1618656516 has 18 divisors (see below), whose sum is σ = 4091604062. Its totient is φ = 539552160.

The previous prime is 1618656511. The next prime is 1618656539. The reversal of 1618656516 is 6156568161.

1618656516 is a `hidden beast` number, since 1 + 6 + 1 + 86 + 56 + 516 = 666.

It can be written as a sum of positive squares in only one way, i.e., 995654916 + 623001600 = 31554^2 + 24960^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1618656511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22481305 + ... + 22481376.

Almost surely, 2^1618656516 is an apocalyptic number.

It is an amenable number.

1618656516 is an abundant number, since it is smaller than the sum of its proper divisors (2472947546).

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

1618656516 is a wasteful number, since it uses less digits than its factorization.

1618656516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44962691 (or 44962686 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 1618656516 is about 40232.5305691800. The cubic root of 1618656516 is about 1174.1355382367.

The spelling of 1618656516 in words is "one billion, six hundred eighteen million, six hundred fifty-six thousand, five hundred sixteen".