67661225536 has 14 divisors (see below), whose sum is σ = 134265244550. Its totient is φ = 33830612736.

The previous prime is 67661225501. The next prime is 67661225537. The reversal of 67661225536 is 63552216676.

It can be written as a sum of positive squares in only one way, i.e., 40256409600 + 27404815936 = 200640^2 + 165544^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 67661225536.

It is not an unprimeable number, because it can be changed into a prime (67661225537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528603261 + ... + 528603388.

Almost surely, 2^67661225536 is an apocalyptic number.

It is an amenable number.

67661225536 is a deficient number, since it is larger than the sum of its proper divisors (66604019014).

67661225536 is a wasteful number, since it uses less digits than its factorization.

67661225536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057206661 (or 1057206651 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 49.

The spelling of 67661225536 in words is "sixty-seven billion, six hundred sixty-one million, two hundred twenty-five thousand, five hundred thirty-six".