666441377 has 8 divisors (see below), whose sum is σ = 762859392. Its totient is φ = 570326400.

The previous prime is 666441371. The next prime is 666441383. The reversal of 666441377 is 773144666.

666441377 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (666441371) and next prime (666441383).

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

It is not a de Polignac number, because 666441377 - 2²⁴ = 649664161 is a prime.

It is a super-2 number, since 2×666441377² = 888288217955312258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666441371) 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, 71024 + ... + 79857.

It is an arithmetic number, because the mean of its divisors is an integer number (95357424).

Almost surely, 2^666441377 is an apocalyptic number.

It is an amenable number.

666441377 is a deficient number, since it is larger than the sum of its proper divisors (96418015).

666441377 is a wasteful number, since it uses less digits than its factorization.

666441377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151519.

The product of its digits is 508032, while the sum is 44.

The square root of 666441377 is about 25815.5258904404. The cubic root of 666441377 is about 873.4820493236.

The spelling of 666441377 in words is "six hundred sixty-six million, four hundred forty-one thousand, three hundred seventy-seven".