61665545 has 16 divisors (see below), whose sum is σ = 82477440. Its totient is φ = 43985664.

The previous prime is 61665533. The next prime is 61665557. The reversal of 61665545 is 54556616.

61665545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61665533) and next prime (61665557).

It is not a de Polignac number, because 61665545 - 2⁴ = 61665529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61665499 and 61665508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17477 + ... + 20706.

It is an arithmetic number, because the mean of its divisors is an integer number (5154840).

Almost surely, 2^61665545 is an apocalyptic number.

It is an amenable number.

61665545 is a deficient number, since it is larger than the sum of its proper divisors (20811895).

61665545 is a wasteful number, since it uses less digits than its factorization.

61665545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38224.

The product of its digits is 108000, while the sum is 38.

The square root of 61665545 is about 7852.7412411208. The cubic root of 61665545 is about 395.0761910389.

It can be divided in two parts, 6166 and 5545, that added together give a palindrome (11711).

The spelling of 61665545 in words is "sixty-one million, six hundred sixty-five thousand, five hundred forty-five".