65561451 has 16 divisors (see below), whose sum is σ = 88905600. Its totient is φ = 42968000.

The previous prime is 65561413. The next prime is 65561453. The reversal of 65561451 is 15416556.

It is a cyclic number.

It is not a de Polignac number, because 65561451 - 2¹³ = 65553259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65561453) 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, 61975 + ... + 63023.

It is an arithmetic number, because the mean of its divisors is an integer number (5556600).

Almost surely, 2^65561451 is an apocalyptic number.

65561451 is a deficient number, since it is larger than the sum of its proper divisors (23344149).

65561451 is a wasteful number, since it uses less digits than its factorization.

65561451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its digits is 18000, while the sum is 33.

The square root of 65561451 is about 8097.0025935528. The cubic root of 65561451 is about 403.2269203748.

The spelling of 65561451 in words is "sixty-five million, five hundred sixty-one thousand, four hundred fifty-one".