6520140461 has 4 divisors (see below), whose sum is σ = 6520328892. Its totient is φ = 6519952032.

The previous prime is 6520140457. The next prime is 6520140469. The reversal of 6520140461 is 1640410256.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4090242025 + 2429898436 = 63955^2 + 49294^2 .

It is a cyclic number.

It is not a de Polignac number, because 6520140461 - 2² = 6520140457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520140469) 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, 25706 + ... + 117051.

It is an arithmetic number, because the mean of its divisors is an integer number (1630082223).

Almost surely, 2^6520140461 is an apocalyptic number.

It is an amenable number.

6520140461 is a deficient number, since it is larger than the sum of its proper divisors (188431).

6520140461 is a wasteful number, since it uses less digits than its factorization.

6520140461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188430.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 6520140461 is about 80747.3867131315. The cubic root of 6520140461 is about 1868.1811421324.

The spelling of 6520140461 in words is "six billion, five hundred twenty million, one hundred forty thousand, four hundred sixty-one".