401564663 has 18 divisors (see below), whose sum is σ = 426895056. Its totient is φ = 377558064.

The previous prime is 401564641. The next prime is 401564717. The reversal of 401564663 is 366465104.

It is a de Polignac number, because none of the positive numbers 2^k-401564663 is a prime.

It is a super-2 number, since 2×401564663² = 322508357140607138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401564063) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5083058 + ... + 5083136.

It is an arithmetic number, because the mean of its divisors is an integer number (23716392).

Almost surely, 2^401564663 is an apocalyptic number.

401564663 is a deficient number, since it is larger than the sum of its proper divisors (25330393).

401564663 is an frugal number, since it uses more digits than its factorization.

401564663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 401564663 is about 20039.0783969723. The cubic root of 401564663 is about 737.7657610815.

The spelling of 401564663 in words is "four hundred one million, five hundred sixty-four thousand, six hundred sixty-three".