6121561611 has 32 divisors (see below), whose sum is σ = 9009861120. Its totient is φ = 3666124800.

The previous prime is 6121561583. The next prime is 6121561613. The reversal of 6121561611 is 1161651216.

It is not a de Polignac number, because 6121561611 - 2¹⁰ = 6121560587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6121561613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1837195 + ... + 1840523.

It is an arithmetic number, because the mean of its divisors is an integer number (281558160).

Almost surely, 2^6121561611 is an apocalyptic number.

6121561611 is a deficient number, since it is larger than the sum of its proper divisors (2888299509).

6121561611 is a wasteful number, since it uses less digits than its factorization.

6121561611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987.

The product of its digits is 2160, while the sum is 30.

The square root of 6121561611 is about 78240.4090671822. The cubic root of 6121561611 is about 1829.3104204090.

The spelling of 6121561611 in words is "six billion, one hundred twenty-one million, five hundred sixty-one thousand, six hundred eleven".