401997663 has 12 divisors (see below), whose sum is σ = 583909560. Its totient is φ = 266500176.

The previous prime is 401997653. The next prime is 401997671. The reversal of 401997663 is 366799104.

It is not a de Polignac number, because 401997663 - 2⁶ = 401997599 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401997643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123156 + ... + 126377.

It is an arithmetic number, because the mean of its divisors is an integer number (48659130).

Almost surely, 2^401997663 is an apocalyptic number.

401997663 is a deficient number, since it is larger than the sum of its proper divisors (181911897).

401997663 is a wasteful number, since it uses less digits than its factorization.

401997663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249718 (or 249715 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 401997663 is about 20049.8793761958. The cubic root of 401997663 is about 738.0308390400.

The spelling of 401997663 in words is "four hundred one million, nine hundred ninety-seven thousand, six hundred sixty-three".