664428451995 has 576 divisors, whose sum is σ = 1600276414464. Its totient is φ = 256433506560.

The previous prime is 664428451993. The next prime is 664428451997. The reversal of 664428451995 is 599154824466.

664428451995 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 28 + 4 + 519 + 95 = 666.

It is an interprime number because it is at equal distance from previous prime (664428451993) and next prime (664428451997).

It is not a de Polignac number, because 664428451995 - 2¹ = 664428451993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (664428451993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 3978613402 + ... + 3978613568.

It is an arithmetic number, because the mean of its divisors is an integer number (2778257664).

Almost surely, 2^664428451995 is an apocalyptic number.

664428451995 is an abundant number, since it is smaller than the sum of its proper divisors (935847962469).

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

664428451995 is a wasteful number, since it uses less digits than its factorization.

664428451995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314 (or 259 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 63.

The spelling of 664428451995 in words is "six hundred sixty-four billion, four hundred twenty-eight million, four hundred fifty-one thousand, nine hundred ninety-five".