66120306404 has 24 divisors (see below), whose sum is σ = 116008935000. Its totient is φ = 32974995456.

The previous prime is 66120306397. The next prime is 66120306407. The reversal of 66120306404 is 40460302166.

It can be written as a sum of positive squares in 4 ways, for example, as 18961840804 + 47158465600 = 137702^2 + 217160^2 .

It is a super-2 number, since 2×66120306404² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66120306407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2871224 + ... + 2894160.

It is an arithmetic number, because the mean of its divisors is an integer number (4833705625).

Almost surely, 2^66120306404 is an apocalyptic number.

It is an amenable number.

66120306404 is a deficient number, since it is larger than the sum of its proper divisors (49888628596).

66120306404 is a wasteful number, since it uses less digits than its factorization.

66120306404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24767 (or 24765 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 66120306404 in words is "sixty-six billion, one hundred twenty million, three hundred six thousand, four hundred four".