6659722 has 4 divisors (see below), whose sum is σ = 9989586. Its totient is φ = 3329860.

The previous prime is 6659713. The next prime is 6659749. The reversal of 6659722 is 2279566.

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

It can be written as a sum of positive squares in only one way, i.e., 5716881 + 942841 = 2391^2 + 971^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1664929 + ... + 1664932.

Almost surely, 2^6659722 is an apocalyptic number.

6659722 is a deficient number, since it is larger than the sum of its proper divisors (3329864).

6659722 is a wasteful number, since it uses less digits than its factorization.

6659722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329863.

The product of its digits is 45360, while the sum is 37.

The square root of 6659722 is about 2580.6437181448. The cubic root of 6659722 is about 188.1418312553.

It can be divided in two parts, 6659 and 722, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 6659722 in words is "six million, six hundred fifty-nine thousand, seven hundred twenty-two".