52665561 has 24 divisors (see below), whose sum is σ = 85490496. Its totient is φ = 30998880.

The previous prime is 52665553. The next prime is 52665563. The reversal of 52665561 is 16556625.

It is a happy number.

It is not a de Polignac number, because 52665561 - 2³ = 52665553 is a prime.

It is a super-2 number, since 2×52665561² = 5547322630889442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52665563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7095 + ... + 12476.

It is an arithmetic number, because the mean of its divisors is an integer number (3562104).

Almost surely, 2^52665561 is an apocalyptic number.

It is an amenable number.

52665561 is a deficient number, since it is larger than the sum of its proper divisors (32824935).

52665561 is a wasteful number, since it uses less digits than its factorization.

52665561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19613 (or 19610 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 52665561 is about 7257.1041745313. The cubic root of 52665561 is about 374.8368143315.

The spelling of 52665561 in words is "fifty-two million, six hundred sixty-five thousand, five hundred sixty-one".