67780120655 has 32 divisors (see below), whose sum is σ = 90887354880. Its totient is φ = 48187146240.

The previous prime is 67780120637. The next prime is 67780120663. The reversal of 67780120655 is 55602108776.

It is not a de Polignac number, because 67780120655 - 2³⁰ = 66706378831 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 301751 + ... + 476039.

It is an arithmetic number, because the mean of its divisors is an integer number (2840229840).

Almost surely, 2^67780120655 is an apocalyptic number.

67780120655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

67780120655 is a deficient number, since it is larger than the sum of its proper divisors (23107234225).

67780120655 is a wasteful number, since it uses less digits than its factorization.

67780120655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174531.

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 67780120655 in words is "sixty-seven billion, seven hundred eighty million, one hundred twenty thousand, six hundred fifty-five".