61566066 has 12 divisors (see below), whose sum is σ = 133393182. Its totient is φ = 20522016.

The previous prime is 61566059. The next prime is 61566091. The reversal of 61566066 is 66066516.

It can be written as a sum of positive squares in only one way, i.e., 37271025 + 24295041 = 6105^2 + 4929^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61566066.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1710151 + ... + 1710186.

Almost surely, 2^61566066 is an apocalyptic number.

61566066 is an abundant number, since it is smaller than the sum of its proper divisors (71827116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61566066 is a wasteful number, since it uses less digits than its factorization.

61566066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3420345 (or 3420342 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 61566066 is about 7846.4046543624. The cubic root of 61566066 is about 394.8636307549.

The spelling of 61566066 in words is "sixty-one million, five hundred sixty-six thousand, sixty-six".