401401620664 has 32 divisors (see below), whose sum is σ = 821372601600. Its totient is φ = 182383319520.

The previous prime is 401401620661. The next prime is 401401620701. The reversal of 401401620664 is 466026104104.

It is a super-2 number, since 2×401401620664² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401401620661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674832 + ... + 1121695.

It is an arithmetic number, because the mean of its divisors is an integer number (25667893800).

Almost surely, 2^401401620664 is an apocalyptic number.

401401620664 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

401401620664 is an abundant number, since it is smaller than the sum of its proper divisors (419970980936).

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

401401620664 is a wasteful number, since it uses less digits than its factorization.

401401620664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799083 (or 1799079 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

Adding to 401401620664 its reverse (466026104104), we get a palindrome (867427724768).

The spelling of 401401620664 in words is "four hundred one billion, four hundred one million, six hundred twenty thousand, six hundred sixty-four".