665106266040 has 128 divisors (see below), whose sum is σ = 2094594508800. Its totient is φ = 168731112960.

The previous prime is 665106266023. The next prime is 665106266047. The reversal of 665106266040 is 40662601566.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 665106265983 and 665106266001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665106266047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1295707 + ... + 1734666.

It is an arithmetic number, because the mean of its divisors is an integer number (16364019600).

Almost surely, 2^665106266040 is an apocalyptic number.

665106266040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665106266040 is an abundant number, since it is smaller than the sum of its proper divisors (1429488242760).

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

665106266040 is a wasteful number, since it uses less digits than its factorization.

665106266040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030477 (or 3030473 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 665106266040 in words is "six hundred sixty-five billion, one hundred six million, two hundred sixty-six thousand, forty".