6641654626 has 4 divisors (see below), whose sum is σ = 9962481942. Its totient is φ = 3320827312.

The previous prime is 6641654597. The next prime is 6641654641. The reversal of 6641654626 is 6264561466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6264561466 = 2 ⋅3132280733.

It can be written as a sum of positive squares in only one way, i.e., 4775501025 + 1866153601 = 69105^2 + 43199^2 .

It is a super-2 number, since 2×6641654626² = 88223152342134399752, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660413655 + ... + 1660413658.

Almost surely, 2^6641654626 is an apocalyptic number.

6641654626 is a deficient number, since it is larger than the sum of its proper divisors (3320827316).

6641654626 is a wasteful number, since it uses less digits than its factorization.

6641654626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320827315.

The product of its digits is 1244160, while the sum is 46.

The square root of 6641654626 is about 81496.3473169197. The cubic root of 6641654626 is about 1879.7153848980.

It can be divided in two parts, 664 and 1654626, that added together give a triangular number (1655290 = T₁₈₁₉).

The spelling of 6641654626 in words is "six billion, six hundred forty-one million, six hundred fifty-four thousand, six hundred twenty-six".