401025666 has 32 divisors (see below), whose sum is σ = 860207040. Its totient is φ = 124248384.

The previous prime is 401025661. The next prime is 401025707. The reversal of 401025666 is 666520104.

401025666 is nontrivially palindromic in base 5.

It is not an unprimeable number, because it can be changed into a prime (401025661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27145 + ... + 39228.

It is an arithmetic number, because the mean of its divisors is an integer number (26881470).

Almost surely, 2^401025666 is an apocalyptic number.

401025666 is an abundant number, since it is smaller than the sum of its proper divisors (459181374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401025666 is a wasteful number, since it uses less digits than its factorization.

401025666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66450.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 401025666 is about 20025.6252336850. The cubic root of 401025666 is about 737.4355265289.

The spelling of 401025666 in words is "four hundred one million, twenty-five thousand, six hundred sixty-six".