7223117661 has 12 divisors (see below), whose sum is σ = 10437350560. Its totient is φ = 4813584840.

The previous prime is 7223117659. The next prime is 7223117663. The reversal of 7223117661 is 1667113227.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7223117659) and next prime (7223117663).

It is not a de Polignac number, because 7223117661 - 2¹ = 7223117659 is a prime.

It is a super-2 number, since 2×7223117661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7223117663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126985 + ... + 174846.

Almost surely, 2^7223117661 is an apocalyptic number.

It is an amenable number.

7223117661 is a deficient number, since it is larger than the sum of its proper divisors (3214232899).

7223117661 is a wasteful number, since it uses less digits than its factorization.

7223117661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304496 (or 304493 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 7223117661 is about 84988.9266963644. The cubic root of 7223117661 is about 1933.0432146480.

The spelling of 7223117661 in words is "seven billion, two hundred twenty-three million, one hundred seventeen thousand, six hundred sixty-one".