6151561665 has 16 divisors (see below), whose sum is σ = 9845178048. Its totient is φ = 3279939776.

The previous prime is 6151561643. The next prime is 6151561667. The reversal of 6151561665 is 5661651516.

It is a cyclic number.

It is not a de Polignac number, because 6151561665 - 2³⁰ = 5077819841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6151561667) 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, 3127 + ... + 110963.

It is an arithmetic number, because the mean of its divisors is an integer number (615323628).

Almost surely, 2^6151561665 is an apocalyptic number.

It is an amenable number.

6151561665 is a deficient number, since it is larger than the sum of its proper divisors (3693616383).

6151561665 is a wasteful number, since it uses less digits than its factorization.

6151561665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111648.

The product of its digits is 162000, while the sum is 42.

The square root of 6151561665 is about 78431.8918871654. The cubic root of 6151561665 is about 1832.2938642118.

The spelling of 6151561665 in words is "six billion, one hundred fifty-one million, five hundred sixty-one thousand, six hundred sixty-five".