63005400666 has 128 divisors (see below), whose sum is σ = 152009760000. Its totient is φ = 19229177088.

The previous prime is 63005400631. The next prime is 63005400683. The reversal of 63005400666 is 66600450036.

It is a super-3 number, since 3×63005400666³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63005400666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56103981 + ... + 56105103.

It is an arithmetic number, because the mean of its divisors is an integer number (1187576250).

Almost surely, 2^63005400666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63005400666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76004880000).

63005400666 is an abundant number, since it is smaller than the sum of its proper divisors (89004359334).

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

63005400666 is a wasteful number, since it uses less digits than its factorization.

63005400666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725 (or 1719 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 63005400666 in words is "sixty-three billion, five million, four hundred thousand, six hundred sixty-six".