664666451078 has 32 divisors (see below), whose sum is σ = 1206662184000. Its totient is φ = 268054354944.

The previous prime is 664666450999. The next prime is 664666451083. The reversal of 664666451078 is 870154666466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1153328 + ... + 1630796.

It is an arithmetic number, because the mean of its divisors is an integer number (37708193250).

Almost surely, 2^664666451078 is an apocalyptic number.

664666451078 is a deficient number, since it is larger than the sum of its proper divisors (541995732922).

664666451078 is a wasteful number, since it uses less digits than its factorization.

664666451078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483344.

The product of its (nonzero) digits is 34836480, while the sum is 59.

The spelling of 664666451078 in words is "six hundred sixty-four billion, six hundred sixty-six million, four hundred fifty-one thousand, seventy-eight".