67420687556 has 6 divisors (see below), whose sum is σ = 117986203230. Its totient is φ = 33710343776.

The previous prime is 67420687531. The next prime is 67420687577. The reversal of 67420687556 is 65578602476.

It can be written as a sum of positive squares in only one way, i.e., 66522726400 + 897961156 = 257920^2 + 29966^2 .

It is a super-2 number, since 2×67420687556² (a number of 22 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 8427585941 + ... + 8427585948.

It is an arithmetic number, because the mean of its divisors is an integer number (19664367205).

Almost surely, 2^67420687556 is an apocalyptic number.

It is an amenable number.

67420687556 is a deficient number, since it is larger than the sum of its proper divisors (50565515674).

67420687556 is a wasteful number, since it uses less digits than its factorization.

67420687556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16855171893 (or 16855171891 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 56.

The spelling of 67420687556 in words is "sixty-seven billion, four hundred twenty million, six hundred eighty-seven thousand, five hundred fifty-six".