67155497779 has 2 divisors, whose sum is σ = 67155497780. Its totient is φ = 67155497778.

The previous prime is 67155497767. The next prime is 67155497803. The reversal of 67155497779 is 97779455176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67155497779 - 2¹³ = 67155489587 is a prime.

It is not a weakly prime, because it can be changed into another prime (67155491779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33577748889 + 33577748890.

It is an arithmetic number, because the mean of its divisors is an integer number (33577748890).

Almost surely, 2^67155497779 is an apocalyptic number.

67155497779 is a deficient number, since it is larger than the sum of its proper divisors (1).

67155497779 is an equidigital number, since it uses as much as digits as its factorization.

67155497779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116688600, while the sum is 67.

The spelling of 67155497779 in words is "sixty-seven billion, one hundred fifty-five million, four hundred ninety-seven thousand, seven hundred seventy-nine".