1620120668 has 6 divisors (see below), whose sum is σ = 2835211176. Its totient is φ = 810060332.

The previous prime is 1620120661. The next prime is 1620120679. The reversal of 1620120668 is 8660210261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620120661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202515080 + ... + 202515087.

It is an arithmetic number, because the mean of its divisors is an integer number (472535196).

Almost surely, 2^1620120668 is an apocalyptic number.

It is an amenable number.

1620120668 is a deficient number, since it is larger than the sum of its proper divisors (1215090508).

1620120668 is a wasteful number, since it uses less digits than its factorization.

1620120668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405030171 (or 405030169 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1620120668 is about 40250.7225773650. The cubic root of 1620120668 is about 1174.4894520741.

The spelling of 1620120668 in words is "one billion, six hundred twenty million, one hundred twenty thousand, six hundred sixty-eight".