65601561 has 8 divisors (see below), whose sum is σ = 87538464. Its totient is φ = 43699520.

The previous prime is 65601559. The next prime is 65601577. The reversal of 65601561 is 16510656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65601561 - 2¹ = 65601559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65601551) 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, 3951 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (10942308).

Almost surely, 2^65601561 is an apocalyptic number.

It is an amenable number.

65601561 is a deficient number, since it is larger than the sum of its proper divisors (21936903).

65601561 is a wasteful number, since it uses less digits than its factorization.

65601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17431.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 65601561 is about 8099.4790573221. The cubic root of 65601561 is about 403.3091340049.

The spelling of 65601561 in words is "sixty-five million, six hundred one thousand, five hundred sixty-one".