67564157440 has 80 divisors (see below), whose sum is σ = 174456912168. Its totient is φ = 24946753536.

The previous prime is 67564157411. The next prime is 67564157461. The reversal of 67564157440 is 4475146576.

It can be written as a sum of positive squares in 4 ways, for example, as 16949956864 + 50614200576 = 130192^2 + 224976^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 981807 + ... + 1048366.

Almost surely, 2^67564157440 is an apocalyptic number.

It is an amenable number.

67564157440 is an abundant number, since it is smaller than the sum of its proper divisors (106892754728).

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

67564157440 is a wasteful number, since it uses less digits than its factorization.

67564157440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030209 (or 2030193 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 49.

The spelling of 67564157440 in words is "sixty-seven billion, five hundred sixty-four million, one hundred fifty-seven thousand, four hundred forty".