400011215651 has 2 divisors, whose sum is σ = 400011215652. Its totient is φ = 400011215650.

The previous prime is 400011215629. The next prime is 400011215683. The reversal of 400011215651 is 156512110004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400011215651 - 2¹⁴ = 400011199267 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400011215651.

It is not a weakly prime, because it can be changed into another prime (400011215621) 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 as a sum of consecutive naturals, namely, 200005607825 + 200005607826.

It is an arithmetic number, because the mean of its divisors is an integer number (200005607826).

Almost surely, 2^400011215651 is an apocalyptic number.

400011215651 is a deficient number, since it is larger than the sum of its proper divisors (1).

400011215651 is an equidigital number, since it uses as much as digits as its factorization.

400011215651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 400011215651 its reverse (156512110004), we get a palindrome (556523325655).

The spelling of 400011215651 in words is "four hundred billion, eleven million, two hundred fifteen thousand, six hundred fifty-one".