400506508811 has 2 divisors, whose sum is σ = 400506508812. Its totient is φ = 400506508810.

The previous prime is 400506508777. The next prime is 400506508813. The reversal of 400506508811 is 118805605004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400506508811 - 2³⁴ = 383326639627 is a prime.

Together with 400506508813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400506508813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200253254405 + 200253254406.

It is an arithmetic number, because the mean of its divisors is an integer number (200253254406).

Almost surely, 2^400506508811 is an apocalyptic number.

400506508811 is a deficient number, since it is larger than the sum of its proper divisors (1).

400506508811 is an equidigital number, since it uses as much as digits as its factorization.

400506508811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 400506508811 in words is "four hundred billion, five hundred six million, five hundred eight thousand, eight hundred eleven".