61533665 has 8 divisors (see below), whose sum is σ = 74249448. Its totient is φ = 48954240.

The previous prime is 61533649. The next prime is 61533673. The reversal of 61533665 is 56633516.

It can be written as a sum of positive squares in 4 ways, for example, as 802816 + 60730849 = 896^2 + 7793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61533665 - 2⁴ = 61533649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33092 + ... + 34901.

It is an arithmetic number, because the mean of its divisors is an integer number (9281181).

Almost surely, 2^61533665 is an apocalyptic number.

It is an amenable number.

61533665 is a deficient number, since it is larger than the sum of its proper divisors (12715783).

61533665 is a wasteful number, since it uses less digits than its factorization.

61533665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68179.

The product of its digits is 48600, while the sum is 35.

The square root of 61533665 is about 7844.3396790297. The cubic root of 61533665 is about 394.7943489660.

The spelling of 61533665 in words is "sixty-one million, five hundred thirty-three thousand, six hundred sixty-five".