53543661 has 4 divisors (see below), whose sum is σ = 71391552. Its totient is φ = 35695772.

The previous prime is 53543647. The next prime is 53543671. The reversal of 53543661 is 16634535.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53543661 - 2⁷ = 53543533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53543641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8923941 + ... + 8923946.

It is an arithmetic number, because the mean of its divisors is an integer number (17847888).

Almost surely, 2^53543661 is an apocalyptic number.

It is an amenable number.

53543661 is a deficient number, since it is larger than the sum of its proper divisors (17847891).

53543661 is a wasteful number, since it uses less digits than its factorization.

53543661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17847890.

The product of its digits is 32400, while the sum is 33.

The square root of 53543661 is about 7317.3534149992. The cubic root of 53543661 is about 376.9085772965.

The spelling of 53543661 in words is "fifty-three million, five hundred forty-three thousand, six hundred sixty-one".