61220566 has 16 divisors (see below), whose sum is σ = 103634640. Its totient is φ = 26867680.

The previous prime is 61220543. The next prime is 61220569. The reversal of 61220566 is 66502216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61220569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47341 + ... + 48616.

It is an arithmetic number, because the mean of its divisors is an integer number (6477165).

Almost surely, 2^61220566 is an apocalyptic number.

61220566 is a deficient number, since it is larger than the sum of its proper divisors (42414074).

61220566 is a wasteful number, since it uses less digits than its factorization.

61220566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95999.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 61220566 is about 7824.3572259963. The cubic root of 61220566 is about 394.1236052188.

The spelling of 61220566 in words is "sixty-one million, two hundred twenty thousand, five hundred sixty-six".