401665658 has 8 divisors (see below), whose sum is σ = 602941428. Its totient is φ = 200685184.

The previous prime is 401665597. The next prime is 401665661. The reversal of 401665658 is 856566104.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 401321089 + 344569 = 20033^2 + 587^2 .

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

It is a super-2 number, since 2×401665658² = 322670601633145928, which contains 22 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 70391 + ... + 75882.

Almost surely, 2^401665658 is an apocalyptic number.

401665658 is a deficient number, since it is larger than the sum of its proper divisors (201275770).

401665658 is a wasteful number, since it uses less digits than its factorization.

401665658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147648.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 401665658 is about 20041.5981897652. The cubic root of 401665658 is about 737.8276061708.

The spelling of 401665658 in words is "four hundred one million, six hundred sixty-five thousand, six hundred fifty-eight".