61552661 has 4 divisors (see below), whose sum is σ = 61617024. Its totient is φ = 61488300.

The previous prime is 61552649. The next prime is 61552679. The reversal of 61552661 is 16625516.

61552661 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61552661 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 (61552691) 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, 30725 + ... + 32666.

It is an arithmetic number, because the mean of its divisors is an integer number (15404256).

Almost surely, 2^61552661 is an apocalyptic number.

It is an amenable number.

61552661 is a deficient number, since it is larger than the sum of its proper divisors (64363).

61552661 is an equidigital number, since it uses as much as digits as its factorization.

61552661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64362.

The product of its digits is 10800, while the sum is 32.

The square root of 61552661 is about 7845.5503949691. The cubic root of 61552661 is about 394.8349703173.

The spelling of 61552661 in words is "sixty-one million, five hundred fifty-two thousand, six hundred sixty-one".