401266664 has 8 divisors (see below), whose sum is σ = 752375010. Its totient is φ = 200633328.

The previous prime is 401266661. The next prime is 401266667. The reversal of 401266664 is 466662104.

It is an interprime number because it is at equal distance from previous prime (401266661) and next prime (401266667).

It can be written as a sum of positive squares in only one way, i.e., 359405764 + 41860900 = 18958^2 + 6470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×401266664² = 322029871275377792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401266661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25079159 + ... + 25079174.

Almost surely, 2^401266664 is an apocalyptic number.

It is an amenable number.

401266664 is a deficient number, since it is larger than the sum of its proper divisors (351108346).

401266664 is a wasteful number, since it uses less digits than its factorization.

401266664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50158339 (or 50158335 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 401266664 is about 20031.6415702758. The cubic root of 401266664 is about 737.5832185707.

The spelling of 401266664 in words is "four hundred one million, two hundred sixty-six thousand, six hundred sixty-four".