7721666352 has 60 divisors (see below), whose sum is σ = 22549513584. Its totient is φ = 2461979520.

The previous prime is 7721666311. The next prime is 7721666357. The reversal of 7721666352 is 2536661277.

It is a junction number, because it is equal to n+sod(n) for n = 7721666298 and 7721666307.

It is not an unprimeable number, because it can be changed into a prime (7721666357) 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 11 ways as a sum of consecutive naturals, for example, 1162399 + ... + 1169022.

Almost surely, 2^7721666352 is an apocalyptic number.

7721666352 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

7721666352 is an abundant number, since it is smaller than the sum of its proper divisors (14827847232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7721666352 is a wasteful number, since it uses less digits than its factorization.

7721666352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331458 (or 2331449 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 7721666352 is about 87873.0126489356. The cubic root of 7721666352 is about 1976.5312145744.

The spelling of 7721666352 in words is "seven billion, seven hundred twenty-one million, six hundred sixty-six thousand, three hundred fifty-two".