401644532445 has 32 divisors (see below), whose sum is σ = 692273433600. Its totient is φ = 197672976384.

The previous prime is 401644532437. The next prime is 401644532447. The reversal of 401644532445 is 544235446104.

It is not a de Polignac number, because 401644532445 - 2³ = 401644532437 is a prime.

It is a super-2 number, since 2×401644532445² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401644532397 and 401644532406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401644532447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 339796 + ... + 958514.

It is an arithmetic number, because the mean of its divisors is an integer number (21633544800).

Almost surely, 2^401644532445 is an apocalyptic number.

It is an amenable number.

401644532445 is a deficient number, since it is larger than the sum of its proper divisors (290628901155).

401644532445 is a wasteful number, since it uses less digits than its factorization.

401644532445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622069.

The product of its (nonzero) digits is 921600, while the sum is 42.

Adding to 401644532445 its reverse (544235446104), we get a palindrome (945879978549).

The spelling of 401644532445 in words is "four hundred one billion, six hundred forty-four million, five hundred thirty-two thousand, four hundred forty-five".