67651664731 has 12 divisors (see below), whose sum is σ = 78721450560. Its totient is φ = 57969003120.

The previous prime is 67651664701. The next prime is 67651664753. The reversal of 67651664731 is 13746615676.

It is not a de Polignac number, because 67651664731 - 2¹⁵ = 67651631963 is a prime.

It is a super-2 number, since 2×67651664731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67651664701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56491 + ... + 372148.

It is an arithmetic number, because the mean of its divisors is an integer number (6560120880).

Almost surely, 2^67651664731 is an apocalyptic number.

67651664731 is a deficient number, since it is larger than the sum of its proper divisors (11069785829).

67651664731 is a wasteful number, since it uses less digits than its factorization.

67651664731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431874 (or 431867 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 52.

The spelling of 67651664731 in words is "sixty-seven billion, six hundred fifty-one million, six hundred sixty-four thousand, seven hundred thirty-one".