61026661 has 4 divisors (see below), whose sum is σ = 61288812. Its totient is φ = 60764512.

The previous prime is 61026619. The next prime is 61026671. The reversal of 61026661 is 16662016.

61026661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 14364100 + 46662561 = 3790^2 + 6831^2 .

It is a cyclic number.

It is not a de Polignac number, because 61026661 - 2⁷ = 61026533 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 (61026611) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 130726 + ... + 131191.

It is an arithmetic number, because the mean of its divisors is an integer number (15322203).

Almost surely, 2^61026661 is an apocalyptic number.

It is an amenable number.

61026661 is a deficient number, since it is larger than the sum of its proper divisors (262151).

61026661 is a wasteful number, since it uses less digits than its factorization.

61026661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262150.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 61026661 is about 7811.9562850799. The cubic root of 61026661 is about 393.7070602036.

Adding to 61026661 its reverse (16662016), we get a palindrome (77688677).

The spelling of 61026661 in words is "sixty-one million, twenty-six thousand, six hundred sixty-one".