7821266606 has 4 divisors (see below), whose sum is σ = 11731899912. Its totient is φ = 3910633302.

The previous prime is 7821266503. The next prime is 7821266623. The reversal of 7821266606 is 6066621287.

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

It is a super-2 number, since 2×7821266606² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1955316650 + ... + 1955316653.

It is an arithmetic number, because the mean of its divisors is an integer number (2932974978).

Almost surely, 2^7821266606 is an apocalyptic number.

7821266606 is a deficient number, since it is larger than the sum of its proper divisors (3910633306).

7821266606 is a wasteful number, since it uses less digits than its factorization.

7821266606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3910633305.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 7821266606 is about 88437.9251565752. The cubic root of 7821266606 is about 1984.9932305665.

The spelling of 7821266606 in words is "seven billion, eight hundred twenty-one million, two hundred sixty-six thousand, six hundred six".