6400540745041 has 3 divisors (see below), whose sum is σ = 6400543274971. Its totient is φ = 6400538215112.

The previous prime is 6400540745023. The next prime is 6400540745057. The reversal of 6400540745041 is 1405470450046.

The square root of 6400540745041 is 2529929.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4500002785041 + 1900537960000 = 2121321^2 + 1378600^2 .

It is not a de Polignac number, because 6400540745041 - 2¹¹ = 6400540742993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6400540744985 and 6400540745003.

It is not an unprimeable number, because it can be changed into a prime (6400540745741) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1264965 + ... + 3794893.

Almost surely, 2^{6400540745041} is an apocalyptic number.

6400540745041 is the 2529929-th square number.

6400540745041 is the 1264965-th centered octagonal number.

It is an amenable number.

6400540745041 is a deficient number, since it is larger than the sum of its proper divisors (2529930).

6400540745041 is an frugal number, since it uses more digits than its factorization.

6400540745041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5059858 (or 2529929 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 40.

The spelling of 6400540745041 in words is "six trillion, four hundred billion, five hundred forty million, seven hundred forty-five thousand, forty-one".