400155031345 has 4 divisors (see below), whose sum is σ = 480186037620. Its totient is φ = 320124025072.

The previous prime is 400155031321. The next prime is 400155031349. The reversal of 400155031345 is 543130551004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 272997890064 + 127157141281 = 522492^2 + 356591^2 .

It is a cyclic number.

It is not a de Polignac number, because 400155031345 - 2⁹ = 400155030833 is a prime.

It is a super-3 number, since 3×400155031345³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (400155031349) 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, 40015503130 + ... + 40015503139.

It is an arithmetic number, because the mean of its divisors is an integer number (120046509405).

Almost surely, 2^400155031345 is an apocalyptic number.

It is an amenable number.

400155031345 is a deficient number, since it is larger than the sum of its proper divisors (80031006275).

400155031345 is an equidigital number, since it uses as much as digits as its factorization.

400155031345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80031006274.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 400155031345 its reverse (543130551004), we get a palindrome (943285582349).

The spelling of 400155031345 in words is "four hundred billion, one hundred fifty-five million, thirty-one thousand, three hundred forty-five".