67909642061 has 4 divisors (see below), whose sum is σ = 67926610752. Its totient is φ = 67892673372.

The previous prime is 67909641907. The next prime is 67909642103. The reversal of 67909642061 is 16024690976.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67909642061 is a prime.

It is a super-2 number, since 2×67909642061² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67909642261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8478341 + ... + 8486346.

It is an arithmetic number, because the mean of its divisors is an integer number (16981652688).

Almost surely, 2^67909642061 is an apocalyptic number.

It is an amenable number.

67909642061 is a deficient number, since it is larger than the sum of its proper divisors (16968691).

67909642061 is a wasteful number, since it uses less digits than its factorization.

67909642061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16968690.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 67909642061 in words is "sixty-seven billion, nine hundred nine million, six hundred forty-two thousand, sixty-one".