65455561 has 4 divisors (see below), whose sum is σ = 65474500. Its totient is φ = 65436624.

The previous prime is 65455547. The next prime is 65455567. The reversal of 65455561 is 16555456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33419961 + 32035600 = 5781^2 + 5660^2 .

It is a cyclic number.

It is not a de Polignac number, because 65455561 - 2¹⁵ = 65422793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65455561.

It is not an unprimeable number, because it can be changed into a prime (65455567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2646 + ... + 11743.

It is an arithmetic number, because the mean of its divisors is an integer number (16368625).

Almost surely, 2^65455561 is an apocalyptic number.

It is an amenable number.

65455561 is a deficient number, since it is larger than the sum of its proper divisors (18939).

65455561 is a wasteful number, since it uses less digits than its factorization.

65455561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18938.

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

The square root of 65455561 is about 8090.4611117043. The cubic root of 65455561 is about 403.0097159761.

The spelling of 65455561 in words is "sixty-five million, four hundred fifty-five thousand, five hundred sixty-one".