67777787121 has 48 divisors (see below), whose sum is σ = 100944497472. Its totient is φ = 40412528640.

The previous prime is 67777787111. The next prime is 67777787131. The reversal of 67777787121 is 12178777776.

It is an interprime number because it is at equal distance from previous prime (67777787111) and next prime (67777787131).

It is not a de Polignac number, because 67777787121 - 2⁵ = 67777787089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67777787111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28040905 + ... + 28043321.

It is an arithmetic number, because the mean of its divisors is an integer number (2103010364).

Almost surely, 2^67777787121 is an apocalyptic number.

It is an amenable number.

67777787121 is a deficient number, since it is larger than the sum of its proper divisors (33166710351).

67777787121 is a wasteful number, since it uses less digits than its factorization.

67777787121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662 (or 3651 counting only the distinct ones).

The product of its digits is 11294304, while the sum is 60.

The spelling of 67777787121 in words is "sixty-seven billion, seven hundred seventy-seven million, seven hundred eighty-seven thousand, one hundred twenty-one".