400020664450 has 48 divisors (see below), whose sum is σ = 830554582176. Its totient is φ = 142079212800.

The previous prime is 400020664447. The next prime is 400020664451. The reversal of 400020664450 is 54466020004.

It is not an unprimeable number, because it can be changed into a prime (400020664451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8433447 + ... + 8480746.

It is an arithmetic number, because the mean of its divisors is an integer number (17303220462).

Almost surely, 2^400020664450 is an apocalyptic number.

400020664450 is an abundant number, since it is smaller than the sum of its proper divisors (430533917726).

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

400020664450 is a wasteful number, since it uses less digits than its factorization.

400020664450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16914259 (or 16914254 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 400020664450 its reverse (54466020004), we get a palindrome (454486684454).

The spelling of 400020664450 in words is "four hundred billion, twenty million, six hundred sixty-four thousand, four hundred fifty".