7655561 has 8 divisors (see below), whose sum is σ = 7973448. Its totient is φ = 7344000.

The previous prime is 7655533. The next prime is 7655569. The reversal of 7655561 is 1655567.

It can be written as a sum of positive squares in 4 ways, for example, as 65536 + 7590025 = 256^2 + 2755^2 .

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 7655561 - 2¹⁸ = 7393417 is a prime.

It is a super-2 number, since 2×7655561² = 117215228449442, which 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 (7655569) 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, 971 + ... + 4031.

It is an arithmetic number, because the mean of its divisors is an integer number (996681).

Almost surely, 2^7655561 is an apocalyptic number.

It is an amenable number.

7655561 is a deficient number, since it is larger than the sum of its proper divisors (317887).

7655561 is a wasteful number, since it uses less digits than its factorization.

7655561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163.

The product of its digits is 31500, while the sum is 35.

The square root of 7655561 is about 2766.8684464571. The cubic root of 7655561 is about 197.0874666352.

The spelling of 7655561 in words is "seven million, six hundred fifty-five thousand, five hundred sixty-one".