667420771855 has 16 divisors (see below), whose sum is σ = 843167905920. Its totient is φ = 505768637088.

The previous prime is 667420771841. The next prime is 667420771939. The reversal of 667420771855 is 558177024766.

It is not a de Polignac number, because 667420771855 - 2¹⁵ = 667420739087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667420771855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278844 + ... + 1188526.

It is an arithmetic number, because the mean of its divisors is an integer number (52697994120).

Almost surely, 2^667420771855 is an apocalyptic number.

667420771855 is a deficient number, since it is larger than the sum of its proper divisors (175747134065).

667420771855 is a wasteful number, since it uses less digits than its factorization.

667420771855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917430.

The product of its (nonzero) digits is 19756800, while the sum is 58.

The spelling of 667420771855 in words is "six hundred sixty-seven billion, four hundred twenty million, seven hundred seventy-one thousand, eight hundred fifty-five".