6520071661111 has 4 divisors (see below), whose sum is σ = 6696289814152. Its totient is φ = 6343853508072.

The previous prime is 6520071661067. The next prime is 6520071661151. The reversal of 6520071661111 is 1111661700256.

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

It is a cyclic number.

It is not a de Polignac number, because 6520071661111 - 2⁷ = 6520071660983 is a prime.

It is a super-2 number, since 2×6520071661111² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 176218153003 = 6520071661111 / (6 + 5 + 2 + 0 + 0 + 7 + 1 + 6 + 6 + 1 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6520071661151) 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, 88109076465 + ... + 88109076538.

It is an arithmetic number, because the mean of its divisors is an integer number (1674072453538).

Almost surely, 2^{6520071661111} is an apocalyptic number.

6520071661111 is a deficient number, since it is larger than the sum of its proper divisors (176218153041).

6520071661111 is a wasteful number, since it uses less digits than its factorization.

6520071661111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176218153040.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 6520071661111 in words is "six trillion, five hundred twenty billion, seventy-one million, six hundred sixty-one thousand, one hundred eleven".