67773660021 has 24 divisors (see below), whose sum is σ = 98688620160. Its totient is φ = 44817552000.

The previous prime is 67773659957. The next prime is 67773660029. The reversal of 67773660021 is 12006637776.

67773660021 is a `hidden beast` number, since 6 + 7 + 7 + 7 + 36 + 600 + 2 + 1 = 666.

It is not a de Polignac number, because 67773660021 - 2⁶ = 67773659957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67773660029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 593556 + ... + 698466.

It is an arithmetic number, because the mean of its divisors is an integer number (4112025840).

Almost surely, 2^67773660021 is an apocalyptic number.

It is an amenable number.

67773660021 is a deficient number, since it is larger than the sum of its proper divisors (30914960139).

67773660021 is a wasteful number, since it uses less digits than its factorization.

67773660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105497 (or 105494 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 45.

The spelling of 67773660021 in words is "sixty-seven billion, seven hundred seventy-three million, six hundred sixty thousand, twenty-one".