6656961719 has 4 divisors (see below), whose sum is σ = 6657288120. Its totient is φ = 6656635320.

The previous prime is 6656961713. The next prime is 6656961743. The reversal of 6656961719 is 9171696566.

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

It is a cyclic number.

It is not a de Polignac number, because 6656961719 - 2⁸ = 6656961463 is a prime.

It is a super-2 number, since 2×6656961719² = 88630278656462869922, 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 (6656961713) 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, 130412 + ... + 174129.

It is an arithmetic number, because the mean of its divisors is an integer number (1664322030).

Almost surely, 2^6656961719 is an apocalyptic number.

6656961719 is a deficient number, since it is larger than the sum of its proper divisors (326401).

6656961719 is a wasteful number, since it uses less digits than its factorization.

6656961719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326400.

The product of its digits is 3674160, while the sum is 56.

The square root of 6656961719 is about 81590.2060237624. The cubic root of 6656961719 is about 1881.1583436999.

The spelling of 6656961719 in words is "six billion, six hundred fifty-six million, nine hundred sixty-one thousand, seven hundred nineteen".