400466015521 has 64 divisors (see below), whose sum is σ = 496635390720. Its totient is φ = 317863203840.

The previous prime is 400466015491. The next prime is 400466015527. The reversal of 400466015521 is 125510664004.

It is not a de Polignac number, because 400466015521 - 2³¹ = 398318531873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400466015527) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 240230730 + ... + 240232396.

It is an arithmetic number, because the mean of its divisors is an integer number (7759927980).

Almost surely, 2^400466015521 is an apocalyptic number.

It is an amenable number.

400466015521 is a deficient number, since it is larger than the sum of its proper divisors (96169375199).

400466015521 is a wasteful number, since it uses less digits than its factorization.

400466015521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 400466015521 its reverse (125510664004), we get a palindrome (525976679525).

The spelling of 400466015521 in words is "four hundred billion, four hundred sixty-six million, fifteen thousand, five hundred twenty-one".