67922561981 has 4 divisors (see below), whose sum is σ = 67923976032. Its totient is φ = 67921147932.

The previous prime is 67922561933. The next prime is 67922562007. The reversal of 67922561981 is 18916522976.

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 67922561981 - 2²⁶ = 67855453117 is a prime.

It is a super-2 number, since 2×67922561981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67922561911) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 632345 + ... + 731918.

It is an arithmetic number, because the mean of its divisors is an integer number (16980994008).

Almost surely, 2^67922561981 is an apocalyptic number.

It is an amenable number.

67922561981 is a deficient number, since it is larger than the sum of its proper divisors (1414051).

67922561981 is a wasteful number, since it uses less digits than its factorization.

67922561981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414050.

The product of its digits is 3265920, while the sum is 56.

The spelling of 67922561981 in words is "sixty-seven billion, nine hundred twenty-two million, five hundred sixty-one thousand, nine hundred eighty-one".