6111661505 has 16 divisors (see below), whose sum is σ = 7731478080. Its totient is φ = 4625105472.

The previous prime is 6111661487. The next prime is 6111661559. The reversal of 6111661505 is 5051661116.

It is a cyclic number.

It is not a de Polignac number, because 6111661505 - 2¹⁶ = 6111595969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16802 + ... + 111828.

It is an arithmetic number, because the mean of its divisors is an integer number (483217380).

Almost surely, 2^6111661505 is an apocalyptic number.

It is an amenable number.

6111661505 is a deficient number, since it is larger than the sum of its proper divisors (1619816575).

6111661505 is a wasteful number, since it uses less digits than its factorization.

6111661505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95728.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 6111661505 is about 78177.1162489382. The cubic root of 6111661505 is about 1828.3237365088.

The spelling of 6111661505 in words is "six billion, one hundred eleven million, six hundred sixty-one thousand, five hundred five".