400865659543 has 4 divisors (see below), whose sum is σ = 400987100488. Its totient is φ = 400744218600.

The previous prime is 400865659499. The next prime is 400865659561. The reversal of 400865659543 is 345956568004.

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 400865659543 - 2²¹ = 400863562391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400865653543) 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, 60715521 + ... + 60722122.

It is an arithmetic number, because the mean of its divisors is an integer number (100246775122).

Almost surely, 2^400865659543 is an apocalyptic number.

400865659543 is a deficient number, since it is larger than the sum of its proper divisors (121440945).

400865659543 is a wasteful number, since it uses less digits than its factorization.

400865659543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121440944.

The product of its (nonzero) digits is 15552000, while the sum is 55.

The spelling of 400865659543 in words is "four hundred billion, eight hundred sixty-five million, six hundred fifty-nine thousand, five hundred forty-three".