400123220155523 has 4 divisors (see below), whose sum is σ = 408636480158880. Its totient is φ = 391609960152168.

The previous prime is 400123220155481. The next prime is 400123220155531. The reversal of 400123220155523 is 325551022321004.

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

It is a cyclic number.

It is not a de Polignac number, because 400123220155523 - 2⁶ = 400123220155459 is a prime.

It is a super-2 number, since 2×400123220155523² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400123220157523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4256630001608 + ... + 4256630001701.

It is an arithmetic number, because the mean of its divisors is an integer number (102159120039720).

Almost surely, 2^{400123220155523} is an apocalyptic number.

400123220155523 is a deficient number, since it is larger than the sum of its proper divisors (8513260003357).

400123220155523 is an equidigital number, since it uses as much as digits as its factorization.

400123220155523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8513260003356.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 400123220155523 its reverse (325551022321004), we get a palindrome (725674242476527).

The spelling of 400123220155523 in words is "four hundred trillion, one hundred twenty-three billion, two hundred twenty million, one hundred fifty-five thousand, five hundred twenty-three".