7772216621 has 8 divisors (see below), whose sum is σ = 8862437304. Its totient is φ = 6752332800.

The previous prime is 7772216609. The next prime is 7772216623. The reversal of 7772216621 is 1266122777.

It can be written as a sum of positive squares in 4 ways, for example, as 60918025 + 7711298596 = 7805^2 + 87814^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7772216621 - 2¹⁴ = 7772200237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7772216623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17583980 + ... + 17584421.

It is an arithmetic number, because the mean of its divisors is an integer number (1107804663).

Almost surely, 2^7772216621 is an apocalyptic number.

It is an amenable number.

7772216621 is a deficient number, since it is larger than the sum of its proper divisors (1090220683).

7772216621 is a wasteful number, since it uses less digits than its factorization.

7772216621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35168431.

The product of its digits is 98784, while the sum is 41.

The square root of 7772216621 is about 88160.1759356230. The cubic root of 7772216621 is about 1980.8349895423.

The spelling of 7772216621 in words is "seven billion, seven hundred seventy-two million, two hundred sixteen thousand, six hundred twenty-one".