6665555401 has 8 divisors (see below), whose sum is σ = 6794643200. Its totient is φ = 6537585600.

The previous prime is 6665555399. The next prime is 6665555417. The reversal of 6665555401 is 1045555666.

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 6665555401 - 2¹ = 6665555399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6665555101) 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, 267456 + ... + 291313.

It is an arithmetic number, because the mean of its divisors is an integer number (849330400).

Almost surely, 2^6665555401 is an apocalyptic number.

It is an amenable number.

6665555401 is a deficient number, since it is larger than the sum of its proper divisors (129087799).

6665555401 is a wasteful number, since it uses less digits than its factorization.

6665555401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558999.

The product of its (nonzero) digits is 540000, while the sum is 43.

The square root of 6665555401 is about 81642.8527245343. The cubic root of 6665555401 is about 1881.9674778480.

The spelling of 6665555401 in words is "six billion, six hundred sixty-five million, five hundred fifty-five thousand, four hundred one".