67765816123 has 16 divisors (see below), whose sum is σ = 69243297760. Its totient is φ = 66303961344.

The previous prime is 67765816099. The next prime is 67765816127. The reversal of 67765816123 is 32161856776.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67765816123 is a prime.

It is a super-2 number, since 2×67765816123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67765816127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20830165 + ... + 20833417.

It is an arithmetic number, because the mean of its divisors is an integer number (4327706110).

Almost surely, 2^67765816123 is an apocalyptic number.

67765816123 is a deficient number, since it is larger than the sum of its proper divisors (1477481637).

67765816123 is a wasteful number, since it uses less digits than its factorization.

67765816123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518.

The product of its digits is 2540160, while the sum is 52.

The spelling of 67765816123 in words is "sixty-seven billion, seven hundred sixty-five million, eight hundred sixteen thousand, one hundred twenty-three".