65561062566 has 16 divisors (see below), whose sum is σ = 135351871488. Its totient is φ = 21148729800.

The previous prime is 65561062561. The next prime is 65561062591. The reversal of 65561062566 is 66526016556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561062561) 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, 176239230 + ... + 176239601.

It is an arithmetic number, because the mean of its divisors is an integer number (8459491968).

Almost surely, 2^65561062566 is an apocalyptic number.

65561062566 is an abundant number, since it is smaller than the sum of its proper divisors (69790808922).

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

65561062566 is a wasteful number, since it uses less digits than its factorization.

65561062566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352478867.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 65561062566 in words is "sixty-five billion, five hundred sixty-one million, sixty-two thousand, five hundred sixty-six".