6523701561 has 24 divisors (see below), whose sum is σ = 10180459016. Its totient is φ = 4001736960.

The previous prime is 6523701521. The next prime is 6523701581. The reversal of 6523701561 is 1651073256.

6523701561 is a `hidden beast` number, since 6 + 5 + 23 + 70 + 1 + 561 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 178623225 + 6345078336 = 13365^2 + 79656^2 .

It is not a de Polignac number, because 6523701561 - 2¹⁰ = 6523700537 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6523701521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52450 + ... + 125691.

Almost surely, 2^6523701561 is an apocalyptic number.

It is an amenable number.

6523701561 is a deficient number, since it is larger than the sum of its proper divisors (3656757455).

6523701561 is a wasteful number, since it uses less digits than its factorization.

6523701561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178473 (or 178470 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 6523701561 is about 80769.4345715011. The cubic root of 6523701561 is about 1868.5211945741.

The spelling of 6523701561 in words is "six billion, five hundred twenty-three million, seven hundred one thousand, five hundred sixty-one".