61605566 has 16 divisors (see below), whose sum is σ = 101705328. Its totient is φ = 27753600.

The previous prime is 61605563. The next prime is 61605589. The reversal of 61605566 is 66550616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61605563) 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, 9905 + ... + 14876.

It is an arithmetic number, because the mean of its divisors is an integer number (6356583).

Almost surely, 2^61605566 is an apocalyptic number.

61605566 is a deficient number, since it is larger than the sum of its proper divisors (40099762).

61605566 is a wasteful number, since it uses less digits than its factorization.

61605566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24907.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 61605566 is about 7848.9213271634. The cubic root of 61605566 is about 394.9480591854.

The spelling of 61605566 in words is "sixty-one million, six hundred five thousand, five hundred sixty-six".