6161500661 has 4 divisors (see below), whose sum is σ = 6218028300. Its totient is φ = 6104973024.

The previous prime is 6161500649. The next prime is 6161500669. The reversal of 6161500661 is 1660051616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3524678161 + 2636822500 = 59369^2 + 51350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6161500661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6161500669) 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 3 ways as a sum of consecutive naturals, for example, 28263656 + ... + 28263873.

It is an arithmetic number, because the mean of its divisors is an integer number (1554507075).

Almost surely, 2^6161500661 is an apocalyptic number.

It is an amenable number.

6161500661 is a deficient number, since it is larger than the sum of its proper divisors (56527639).

6161500661 is a wasteful number, since it uses less digits than its factorization.

6161500661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56527638.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 6161500661 is about 78495.2269950218. The cubic root of 6161500661 is about 1833.2801374721.

The spelling of 6161500661 in words is "six billion, one hundred sixty-one million, five hundred thousand, six hundred sixty-one".