65280561 has 16 divisors (see below), whose sum is σ = 97012800. Its totient is φ = 38803968.

The previous prime is 65280547. The next prime is 65280581. The reversal of 65280561 is 16508256.

It is not a de Polignac number, because 65280561 - 2⁶ = 65280497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65280511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32716 + ... + 34653.

It is an arithmetic number, because the mean of its divisors is an integer number (6063300).

Almost surely, 2^65280561 is an apocalyptic number.

It is an amenable number.

65280561 is a deficient number, since it is larger than the sum of its proper divisors (31732239).

65280561 is a wasteful number, since it uses less digits than its factorization.

65280561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67408.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 65280561 is about 8079.6386676633. The cubic root of 65280561 is about 402.6502372426.

The spelling of 65280561 in words is "sixty-five million, two hundred eighty thousand, five hundred sixty-one".