667232838778 has 64 divisors (see below), whose sum is σ = 1107882547200. Its totient is φ = 298863639360.

The previous prime is 667232838773. The next prime is 667232838841. The reversal of 667232838778 is 877838232766.

667232838778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×667232838778² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667232838773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 726041803 + ... + 726042721.

It is an arithmetic number, because the mean of its divisors is an integer number (17310664800).

Almost surely, 2^667232838778 is an apocalyptic number.

667232838778 is a deficient number, since it is larger than the sum of its proper divisors (440649708422).

667232838778 is a wasteful number, since it uses less digits than its factorization.

667232838778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267.

The product of its digits is 227598336, while the sum is 67.

The spelling of 667232838778 in words is "six hundred sixty-seven billion, two hundred thirty-two million, eight hundred thirty-eight thousand, seven hundred seventy-eight".