67060721551 has 6 divisors (see below), whose sum is σ = 68178103656. Its totient is φ = 65961361800.

The previous prime is 67060721537. The next prime is 67060721579. The reversal of 67060721551 is 15512706076.

It is a happy number.

It is not a de Polignac number, because 67060721551 - 2¹¹ = 67060719503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67060721501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9007395 + ... + 9014836.

It is an arithmetic number, because the mean of its divisors is an integer number (11363017276).

Almost surely, 2^67060721551 is an apocalyptic number.

67060721551 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

67060721551 is a deficient number, since it is larger than the sum of its proper divisors (1117382105).

67060721551 is an equidigital number, since it uses as much as digits as its factorization.

67060721551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18022353 (or 18022292 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 67060721551 in words is "sixty-seven billion, sixty million, seven hundred twenty-one thousand, five hundred fifty-one".