61565533 has 4 divisors (see below), whose sum is σ = 61703100. Its totient is φ = 61427968.

The previous prime is 61565527. The next prime is 61565587. The reversal of 61565533 is 33556516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29789764 + 31775769 = 5458^2 + 5637^2 .

It is a cyclic number.

It is not a de Polignac number, because 61565533 - 2⁵ = 61565501 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 (61565593) 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, 68110 + ... + 69007.

It is an arithmetic number, because the mean of its divisors is an integer number (15425775).

Almost surely, 2^61565533 is an apocalyptic number.

It is an amenable number.

61565533 is a deficient number, since it is larger than the sum of its proper divisors (137567).

61565533 is a wasteful number, since it uses less digits than its factorization.

61565533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137566.

The product of its digits is 40500, while the sum is 34.

The square root of 61565533 is about 7846.3706896883. The cubic root of 61565533 is about 394.8624912585.

The spelling of 61565533 in words is "sixty-one million, five hundred sixty-five thousand, five hundred thirty-three".