6414121661 has 4 divisors (see below), whose sum is σ = 6635298300. Its totient is φ = 6192945024.

The previous prime is 6414121583. The next prime is 6414121667. The reversal of 6414121661 is 1661214146.

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 5524948900 + 889172761 = 74330^2 + 29819^2 .

It is a cyclic number.

It is not a de Polignac number, because 6414121661 - 2¹⁰ = 6414120637 is a prime.

It is a super-2 number, since 2×6414121661² = 82281913364218797842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6414121667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110588276 + ... + 110588333.

It is an arithmetic number, because the mean of its divisors is an integer number (1658824575).

Almost surely, 2^6414121661 is an apocalyptic number.

It is an amenable number.

6414121661 is a deficient number, since it is larger than the sum of its proper divisors (221176639).

6414121661 is a wasteful number, since it uses less digits than its factorization.

6414121661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221176638.

The product of its digits is 6912, while the sum is 32.

The square root of 6414121661 is about 80088.2117480469. The cubic root of 6414121661 is about 1858.0000916333. Note that the first 4 decimals are identical.

The spelling of 6414121661 in words is "six billion, four hundred fourteen million, one hundred twenty-one thousand, six hundred sixty-one".