666376555 has 8 divisors (see below), whose sum is σ = 861163632. Its totient is φ = 492093408.

The previous prime is 666376537. The next prime is 666376559. The reversal of 666376555 is 555673666.

666376555 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666376555 - 2⁹ = 666376043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666376499 and 666376508.

It is not an unprimeable number, because it can be changed into a prime (666376559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5125909 + ... + 5126038.

It is an arithmetic number, because the mean of its divisors is an integer number (107645454).

Almost surely, 2^666376555 is an apocalyptic number.

666376555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

666376555 is a deficient number, since it is larger than the sum of its proper divisors (194787077).

666376555 is a wasteful number, since it uses less digits than its factorization.

666376555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10251965.

The product of its digits is 3402000, while the sum is 49.

The square root of 666376555 is about 25814.2703751239. The cubic root of 666376555 is about 873.4537284084.

The spelling of 666376555 in words is "six hundred sixty-six million, three hundred seventy-six thousand, five hundred fifty-five".