401015666 has 8 divisors (see below), whose sum is σ = 608282460. Its totient is φ = 198254848.

The previous prime is 401015663. The next prime is 401015677. The reversal of 401015666 is 666510104.

It can be written as a sum of positive squares in 2 ways, for example, as 399400225 + 1615441 = 19985^2 + 1271^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (401015663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1126271 + ... + 1126626.

Almost surely, 2^401015666 is an apocalyptic number.

401015666 is a deficient number, since it is larger than the sum of its proper divisors (207266794).

401015666 is a wasteful number, since it uses less digits than its factorization.

401015666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252988.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 401015666 is about 20025.3755520340. The cubic root of 401015666 is about 737.4293968991.

The spelling of 401015666 in words is "four hundred one million, fifteen thousand, six hundred sixty-six".