1664063557632 has 312 divisors, whose sum is σ = 5734866398400. Its totient is φ = 475445182464.

The previous prime is 1664063557621. The next prime is 1664063557643. The reversal of 1664063557632 is 2367553604661.

1664063557632 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 0 + 6 + 35 + 576 + 32 = 666.

It is an interprime number because it is at equal distance from previous prime (1664063557621) and next prime (1664063557643).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5265469 + ... + 5572547.

Almost surely, 2^{1664063557632} is an apocalyptic number.

1664063557632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664063557632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2867433199200).

1664063557632 is an abundant number, since it is smaller than the sum of its proper divisors (4070802840768).

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

1664063557632 is an equidigital number, since it uses as much as digits as its factorization.

1664063557632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307126 (or 307091 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 54.

The spelling of 1664063557632 in words is "one trillion, six hundred sixty-four billion, sixty-three million, five hundred fifty-seven thousand, six hundred thirty-two".