401166665 has 24 divisors (see below), whose sum is σ = 516818880. Its totient is φ = 298809504.

The previous prime is 401166653. The next prime is 401166677. The reversal of 401166665 is 566661104.

It is an interprime number because it is at equal distance from previous prime (401166653) and next prime (401166677).

It is not a de Polignac number, because 401166665 - 2¹⁰ = 401165641 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104612 + ... + 108378.

It is an arithmetic number, because the mean of its divisors is an integer number (21534120).

Almost surely, 2^401166665 is an apocalyptic number.

It is an amenable number.

401166665 is a deficient number, since it is larger than the sum of its proper divisors (115652215).

401166665 is a wasteful number, since it uses less digits than its factorization.

401166665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869 (or 3850 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 401166665 is about 20029.1453886580. The cubic root of 401166665 is about 737.5219428500.

The spelling of 401166665 in words is "four hundred one million, one hundred sixty-six thousand, six hundred sixty-five".