65561554 has 16 divisors (see below), whose sum is σ = 104606208. Its totient is φ = 30710592.

The previous prime is 65561543. The next prime is 65561563. The reversal of 65561554 is 45516556.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3259 + ... + 11905.

It is an arithmetic number, because the mean of its divisors is an integer number (6537888).

Almost surely, 2^65561554 is an apocalyptic number.

65561554 is a deficient number, since it is larger than the sum of its proper divisors (39044654).

65561554 is a wasteful number, since it uses less digits than its factorization.

65561554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8889.

The product of its digits is 90000, while the sum is 37.

The square root of 65561554 is about 8097.0089539286. The cubic root of 65561554 is about 403.2271315373.

The spelling of 65561554 in words is "sixty-five million, five hundred sixty-one thousand, five hundred fifty-four".