666411551 has 8 divisors (see below), whose sum is σ = 737071104. Its totient is φ = 598523040.

The previous prime is 666411479. The next prime is 666411553. The reversal of 666411551 is 155114666.

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 666411551 - 2¹⁴ = 666395167 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 (666411553) 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, 692255 + ... + 693216.

It is an arithmetic number, because the mean of its divisors is an integer number (92133888).

Almost surely, 2^666411551 is an apocalyptic number.

666411551 is a deficient number, since it is larger than the sum of its proper divisors (70659553).

666411551 is a wasteful number, since it uses less digits than its factorization.

666411551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385521.

The product of its digits is 21600, while the sum is 35.

The square root of 666411551 is about 25814.9482083540. The cubic root of 666411551 is about 873.4690184879.

The spelling of 666411551 in words is "six hundred sixty-six million, four hundred eleven thousand, five hundred fifty-one".