7106021661 has 4 divisors (see below), whose sum is σ = 9474695552. Its totient is φ = 4737347772.

The previous prime is 7106021653. The next prime is 7106021687. The reversal of 7106021661 is 1661206017.

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 not a de Polignac number, because 7106021661 - 2³ = 7106021653 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 (7106021561) 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, 1184336941 + ... + 1184336946.

It is an arithmetic number, because the mean of its divisors is an integer number (2368673888).

Almost surely, 2^7106021661 is an apocalyptic number.

It is an amenable number.

7106021661 is a deficient number, since it is larger than the sum of its proper divisors (2368673891).

7106021661 is a wasteful number, since it uses less digits than its factorization.

7106021661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368673890.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 7106021661 is about 84297.2221428441. Note that the first 3 decimals coincide. The cubic root of 7106021661 is about 1922.5405515089.

Adding to 7106021661 its reverse (1661206017), we get a palindrome (8767227678).

The spelling of 7106021661 in words is "seven billion, one hundred six million, twenty-one thousand, six hundred sixty-one".