66511006464 has 144 divisors (see below), whose sum is σ = 202549346048. Its totient is φ = 18980130816.

The previous prime is 66511006451. The next prime is 66511006519. The reversal of 66511006464 is 46460011566.

It is a happy number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4707699 + ... + 4721805.

Almost surely, 2^66511006464 is an apocalyptic number.

66511006464 is a gapful number since it is divisible by the number (64) 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 66511006464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101274673024).

66511006464 is an abundant number, since it is smaller than the sum of its proper divisors (136038339584).

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

66511006464 is a wasteful number, since it uses less digits than its factorization.

66511006464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15010 (or 14996 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 66511006464 in words is "sixty-six billion, five hundred eleven million, six thousand, four hundred sixty-four".