400520312553 has 4 divisors (see below), whose sum is σ = 534027083408. Its totient is φ = 267013541700.

The previous prime is 400520312509. The next prime is 400520312557. The reversal of 400520312553 is 355213025004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 400520312553 - 2¹² = 400520308457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400520312553.

It is not an unprimeable number, because it can be changed into a prime (400520312557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66753385423 + ... + 66753385428.

It is an arithmetic number, because the mean of its divisors is an integer number (133506770852).

Almost surely, 2^400520312553 is an apocalyptic number.

It is an amenable number.

400520312553 is a deficient number, since it is larger than the sum of its proper divisors (133506770855).

400520312553 is a wasteful number, since it uses less digits than its factorization.

400520312553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133506770854.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 400520312553 its reverse (355213025004), we get a palindrome (755733337557).

The spelling of 400520312553 in words is "four hundred billion, five hundred twenty million, three hundred twelve thousand, five hundred fifty-three".