401540077709 has 16 divisors (see below), whose sum is σ = 405533484720. Its totient is φ = 397570567680.

The previous prime is 401540077669. The next prime is 401540077751. The reversal of 401540077709 is 907770045104.

It can be written as a sum of positive squares in 8 ways, for example, as 3627652900 + 397912424809 = 60230^2 + 630803^2 .

It is a cyclic number.

It is not a de Polignac number, because 401540077709 - 2¹⁶ = 401540012173 is a prime.

It is a super-2 number, since 2×401540077709² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 401540077709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401540077769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46789799 + ... + 46798379.

It is an arithmetic number, because the mean of its divisors is an integer number (25345842795).

Almost surely, 2^401540077709 is an apocalyptic number.

It is an amenable number.

401540077709 is a deficient number, since it is larger than the sum of its proper divisors (3993407011).

401540077709 is a wasteful number, since it uses less digits than its factorization.

401540077709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9920.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 401540077709 in words is "four hundred one billion, five hundred forty million, seventy-seven thousand, seven hundred nine".