67507991329 has 3 divisors (see below), whose sum is σ = 67508251153. Its totient is φ = 67507731506.

The previous prime is 67507991303. The next prime is 67507991333. The reversal of 67507991329 is 92319970576.

The square root of 67507991329 is 259823.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 67507991329 - 2⁵ = 67507991297 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67507991339) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 129912 + ... + 389734.

Almost surely, 2^67507991329 is an apocalyptic number.

67507991329 is the 259823-rd square number.

67507991329 is the 129912-nd centered octagonal number.

It is an amenable number.

67507991329 is a deficient number, since it is larger than the sum of its proper divisors (259824).

67507991329 is an frugal number, since it uses more digits than its factorization.

67507991329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519646 (or 259823 counting only the distinct ones).

The product of its (nonzero) digits is 6429780, while the sum is 58.

The spelling of 67507991329 in words is "sixty-seven billion, five hundred seven million, nine hundred ninety-one thousand, three hundred twenty-nine".