67280668261 has 4 divisors (see below), whose sum is σ = 67379176512. Its totient is φ = 67182160012.

The previous prime is 67280668183. The next prime is 67280668267. The reversal of 67280668261 is 16286608276.

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 not a de Polignac number, because 67280668261 - 2⁹ = 67280667749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 67280668199 and 67280668208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67280668267) 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, 49253101 + ... + 49254466.

It is an arithmetic number, because the mean of its divisors is an integer number (16844794128).

Almost surely, 2^67280668261 is an apocalyptic number.

It is an amenable number.

67280668261 is a deficient number, since it is larger than the sum of its proper divisors (98508251).

67280668261 is an equidigital number, since it uses as much as digits as its factorization.

67280668261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98508250.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 67280668261 in words is "sixty-seven billion, two hundred eighty million, six hundred sixty-eight thousand, two hundred sixty-one".