6018811561 has 9 divisors (see below), whose sum is σ = 7002106461. Its totient is φ = 5158515852.

The previous prime is 6018811549. The next prime is 6018811573. The reversal of 6018811561 is 1651188106.

The square root of 6018811561 is 77581.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (6018811549) and next prime (6018811573).

It is not a de Polignac number, because 6018811561 - 2⁷ = 6018811433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6018811561.

It is not an unprimeable number, because it can be changed into a prime (6018811861) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 537526 + ... + 548608.

It is an arithmetic number, because the mean of its divisors is an integer number (778011829).

Almost surely, 2^6018811561 is an apocalyptic number.

6018811561 is the 77581-st square number.

6018811561 is the 38791-st centered octagonal number.

It is an amenable number.

6018811561 is a deficient number, since it is larger than the sum of its proper divisors (983294900).

6018811561 is an frugal number, since it uses more digits than its factorization.

6018811561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22180 (or 11090 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 37.

The cubic root of 6018811561 is about 1819.0176602156.

Adding to 6018811561 its reverse (1651188106), we get a palindrome (7669999667).

The spelling of 6018811561 in words is "six billion, eighteen million, eight hundred eleven thousand, five hundred sixty-one".