400421503411551 has 48 divisors (see below), whose sum is σ = 615716220887040. Its totient is φ = 250050130384320.

The previous prime is 400421503411537. The next prime is 400421503411733. The reversal of 400421503411551 is 155114305124004.

400421503411551 is a `hidden beast` number, since 4 + 0 + 0 + 4 + 21 + 50 + 34 + 1 + 1 + 551 = 666.

It is not a de Polignac number, because 400421503411551 - 2¹⁵ = 400421503378783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400421503411151) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25101355 + ... + 37827516.

It is an arithmetic number, because the mean of its divisors is an integer number (12827421268480).

Almost surely, 2^{400421503411551} is an apocalyptic number.

400421503411551 is a deficient number, since it is larger than the sum of its proper divisors (215294717475489).

400421503411551 is a wasteful number, since it uses less digits than its factorization.

400421503411551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62929316 (or 62929313 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 400421503411551 its reverse (155114305124004), we get a palindrome (555535808535555).

The spelling of 400421503411551 in words is "four hundred trillion, four hundred twenty-one billion, five hundred three million, four hundred eleven thousand, five hundred fifty-one".