66004643640426 has 32 divisors (see below), whose sum is σ = 139171916136960. Its totient is φ = 20811355931376.

The previous prime is 66004643640401. The next prime is 66004643640443. The reversal of 66004643640426 is 62404634640066.

It is a super-2 number, since 2×66004643640426² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447366816 + ... + 447514331.

It is an arithmetic number, because the mean of its divisors is an integer number (4349122379280).

Almost surely, 2^{66004643640426} is an apocalyptic number.

66004643640426 is an abundant number, since it is smaller than the sum of its proper divisors (73167272496534).

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

66004643640426 is a wasteful number, since it uses less digits than its factorization.

66004643640426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894881818.

The product of its (nonzero) digits is 11943936, while the sum is 51.

The spelling of 66004643640426 in words is "sixty-six trillion, four billion, six hundred forty-three million, six hundred forty thousand, four hundred twenty-six".