667021115550 has 24 divisors (see below), whose sum is σ = 1654212366936. Its totient is φ = 177872297440.

The previous prime is 667021115521. The next prime is 667021115591. The reversal of 667021115550 is 55511120766.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 667021115499 and 667021115508.

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 11 ways as a sum of consecutive naturals, for example, 2223403569 + ... + 2223403868.

It is an arithmetic number, because the mean of its divisors is an integer number (68925515289).

Almost surely, 2^667021115550 is an apocalyptic number.

667021115550 is an abundant number, since it is smaller than the sum of its proper divisors (987191251386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667021115550 is a wasteful number, since it uses less digits than its factorization.

667021115550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446807452 (or 4446807447 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 667021115550 in words is "six hundred sixty-seven billion, twenty-one million, one hundred fifteen thousand, five hundred fifty".