6520722761 has 8 divisors (see below), whose sum is σ = 7709229120. Its totient is φ = 5396460048.

The previous prime is 6520722721. The next prime is 6520722797. The reversal of 6520722761 is 1672270256.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6520722761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6520722721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16060691 + ... + 16061096.

It is an arithmetic number, because the mean of its divisors is an integer number (963653640).

Almost surely, 2^6520722761 is an apocalyptic number.

It is an amenable number.

6520722761 is a deficient number, since it is larger than the sum of its proper divisors (1188506359).

6520722761 is a wasteful number, since it uses less digits than its factorization.

6520722761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32121823.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 6520722761 is about 80750.9923220761. The cubic root of 6520722761 is about 1868.2367549168.

The spelling of 6520722761 in words is "six billion, five hundred twenty million, seven hundred twenty-two thousand, seven hundred sixty-one".