664150981668 has 24 divisors (see below), whose sum is σ = 1640843602272. Its totient is φ = 208361092224.

The previous prime is 664150981643. The next prime is 664150981691. The reversal of 664150981668 is 866189051466.

664150981668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1627820830 + ... + 1627821237.

It is an arithmetic number, because the mean of its divisors is an integer number (68368483428).

Almost surely, 2^664150981668 is an apocalyptic number.

664150981668 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

664150981668 is an abundant number, since it is smaller than the sum of its proper divisors (976692620604).

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

664150981668 is a wasteful number, since it uses less digits than its factorization.

664150981668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255642091 (or 3255642089 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 664150981668 in words is "six hundred sixty-four billion, one hundred fifty million, nine hundred eighty-one thousand, six hundred sixty-eight".