77905555667 has 8 divisors (see below), whose sum is σ = 78751542576. Its totient is φ = 77063588352.

The previous prime is 77905555661. The next prime is 77905555681. The reversal of 77905555667 is 76655550977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77905555667 - 2⁶ = 77905555603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77905555661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965918 + ... + 1043459.

It is an arithmetic number, because the mean of its divisors is an integer number (9843942822).

Almost surely, 2^77905555667 is an apocalyptic number.

77905555667 is a deficient number, since it is larger than the sum of its proper divisors (845986909).

77905555667 is a wasteful number, since it uses less digits than its factorization.

77905555667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009797.

The product of its (nonzero) digits is 69457500, while the sum is 62.

The spelling of 77905555667 in words is "seventy-seven billion, nine hundred five million, five hundred fifty-five thousand, six hundred sixty-seven".