66604915872 has 504 divisors, whose sum is σ = 226672810560. Its totient is φ = 19094434560.

The previous prime is 66604915837. The next prime is 66604915877. The reversal of 66604915872 is 27851940666.

66604915872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×66604915872³ (a number of 33 digits) contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (66604915877) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 92635129 + ... + 92635847.

It is an arithmetic number, because the mean of its divisors is an integer number (449747640).

Almost surely, 2^66604915872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66604915872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113336405280).

66604915872 is an abundant number, since it is smaller than the sum of its proper divisors (160067894688).

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

66604915872 is a wasteful number, since it uses less digits than its factorization.

66604915872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 754 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 66604915872 in words is "sixty-six billion, six hundred four million, nine hundred fifteen thousand, eight hundred seventy-two".