666416775540 has 96 divisors (see below), whose sum is σ = 1926367027200. Its totient is φ = 171959990400.

The previous prime is 666416775539. The next prime is 666416775569. The reversal of 666416775540 is 45577614666.

It is a super-2 number, since 2×666416775540² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28838911 + ... + 28862009.

It is an arithmetic number, because the mean of its divisors is an integer number (20066323200).

Almost surely, 2^666416775540 is an apocalyptic number.

666416775540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666416775540 is an abundant number, since it is smaller than the sum of its proper divisors (1259950251660).

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

666416775540 is a wasteful number, since it uses less digits than its factorization.

666416775540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38653 (or 38651 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 57.

The spelling of 666416775540 in words is "six hundred sixty-six billion, four hundred sixteen million, seven hundred seventy-five thousand, five hundred forty".