400520422551 has 4 divisors (see below), whose sum is σ = 534027230072. Its totient is φ = 267013615032.

The previous prime is 400520422543. The next prime is 400520422567. The reversal of 400520422551 is 155224025004.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 400520422551 - 2³ = 400520422543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400520822551) 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 3 ways as a sum of consecutive naturals, for example, 66753403756 + ... + 66753403761.

It is an arithmetic number, because the mean of its divisors is an integer number (133506807518).

Almost surely, 2^400520422551 is an apocalyptic number.

400520422551 is a deficient number, since it is larger than the sum of its proper divisors (133506807521).

400520422551 is a wasteful number, since it uses less digits than its factorization.

400520422551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133506807520.

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 400520422551 its reverse (155224025004), we get a palindrome (555744447555).

The spelling of 400520422551 in words is "four hundred billion, five hundred twenty million, four hundred twenty-two thousand, five hundred fifty-one".