6120001661 has 4 divisors (see below), whose sum is σ = 6138491424. Its totient is φ = 6101511900.

The previous prime is 6120001627. The next prime is 6120001753. The reversal of 6120001661 is 1661000216.

6120001661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6120001661 - 2¹⁰ = 6120000637 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 (6120001861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9244385 + ... + 9245046.

It is an arithmetic number, because the mean of its divisors is an integer number (1534622856).

Almost surely, 2^6120001661 is an apocalyptic number.

It is an amenable number.

6120001661 is a deficient number, since it is larger than the sum of its proper divisors (18489763).

6120001661 is a wasteful number, since it uses less digits than its factorization.

6120001661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18489762.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 6120001661 is about 78230.4394785048. The cubic root of 6120001661 is about 1829.1550202349.

Adding to 6120001661 its reverse (1661000216), we get a palindrome (7781001877).

The spelling of 6120001661 in words is "six billion, one hundred twenty million, one thousand, six hundred sixty-one".