66904224672 has 24 divisors (see below), whose sum is σ = 175623590016. Its totient is φ = 22301408192.

The previous prime is 66904224671. The next prime is 66904224683. The reversal of 66904224672 is 27642240966.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×66904224672² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (66904224671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348459408 + ... + 348459599.

It is an arithmetic number, because the mean of its divisors is an integer number (7317649584).

Almost surely, 2^66904224672 is an apocalyptic number.

It is an amenable number.

66904224672 is an abundant number, since it is smaller than the sum of its proper divisors (108719365344).

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

66904224672 is a wasteful number, since it uses less digits than its factorization.

66904224672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696919020 (or 696919012 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 48.

The spelling of 66904224672 in words is "sixty-six billion, nine hundred four million, two hundred twenty-four thousand, six hundred seventy-two".