1618630668 has 48 divisors (see below), whose sum is σ = 4208436960. Its totient is φ = 538002432.

The previous prime is 1618630667. The next prime is 1618630703. The reversal of 1618630668 is 8660368161.

1618630668 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 630 + 6 + 6 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1618630661) 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, 16896 + ... + 59352.

It is an arithmetic number, because the mean of its divisors is an integer number (87675770).

Almost surely, 2^1618630668 is an apocalyptic number.

1618630668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1618630668 is an abundant number, since it is smaller than the sum of its proper divisors (2589806292).

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

1618630668 is a wasteful number, since it uses less digits than its factorization.

1618630668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42823 (or 42815 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1618630668 is about 40232.2093353075. The cubic root of 1618630668 is about 1174.1292883588.

The spelling of 1618630668 in words is "one billion, six hundred eighteen million, six hundred thirty thousand, six hundred sixty-eight".