666261455 has 8 divisors (see below), whose sum is σ = 825304704. Its totient is φ = 515815200.

The previous prime is 666261451. The next prime is 666261461. The reversal of 666261455 is 554162666.

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

It is not a de Polignac number, because 666261455 - 2² = 666261451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666261451) 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, 2149076 + ... + 2149385.

It is an arithmetic number, because the mean of its divisors is an integer number (103163088).

Almost surely, 2^666261455 is an apocalyptic number.

666261455 is a deficient number, since it is larger than the sum of its proper divisors (159043249).

666261455 is a wasteful number, since it uses less digits than its factorization.

666261455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4298497.

The product of its digits is 259200, while the sum is 41.

The square root of 666261455 is about 25812.0408918009. The cubic root of 666261455 is about 873.4034363664.

The spelling of 666261455 in words is "six hundred sixty-six million, two hundred sixty-one thousand, four hundred fifty-five".