667420773428 has 12 divisors (see below), whose sum is σ = 1174439318052. Its totient is φ = 331866682560.

The previous prime is 667420773419. The next prime is 667420773443. The reversal of 667420773428 is 824377024766.

It can be written as a sum of positive squares in 2 ways, for example, as 163516714384 + 503904059044 = 404372^2 + 709862^2 .

It is a super-3 number, since 3×667420773428³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460925225 + ... + 460926672.

It is an arithmetic number, because the mean of its divisors is an integer number (97869943171).

Almost surely, 2^667420773428 is an apocalyptic number.

It is an amenable number.

667420773428 is a deficient number, since it is larger than the sum of its proper divisors (507018544624).

667420773428 is a wasteful number, since it uses less digits than its factorization.

667420773428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921852082 (or 921852080 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 56.

The spelling of 667420773428 in words is "six hundred sixty-seven billion, four hundred twenty million, seven hundred seventy-three thousand, four hundred twenty-eight".