6520218497 has 16 divisors (see below), whose sum is σ = 7057637328. Its totient is φ = 5988003840.

The previous prime is 6520218487. The next prime is 6520218517. The reversal of 6520218497 is 7948120256.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4701707761 + 1818510736 = 68569^2 + 42644^2 .

It is not a de Polignac number, because 6520218497 - 2²⁶ = 6453109633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6520218487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2737247 + ... + 2739627.

It is an arithmetic number, because the mean of its divisors is an integer number (441102333).

Almost surely, 2^6520218497 is an apocalyptic number.

It is an amenable number.

6520218497 is a deficient number, since it is larger than the sum of its proper divisors (537418831).

6520218497 is a wasteful number, since it uses less digits than its factorization.

6520218497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 6520218497 is about 80747.8699223701. The cubic root of 6520218497 is about 1868.1885951826.

The spelling of 6520218497 in words is "six billion, five hundred twenty million, two hundred eighteen thousand, four hundred ninety-seven".