66014561 has 4 divisors (see below), whose sum is σ = 66248112. Its totient is φ = 65781012.

The previous prime is 66014537. The next prime is 66014563. The reversal of 66014561 is 16541066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16541066 = 2 ⋅8270533.

It is a cyclic number.

It is not a de Polignac number, because 66014561 - 2¹⁰ = 66013537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66014563) 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, 116351 + ... + 116916.

It is an arithmetic number, because the mean of its divisors is an integer number (16562028).

Almost surely, 2^66014561 is an apocalyptic number.

It is an amenable number.

66014561 is a deficient number, since it is larger than the sum of its proper divisors (233551).

66014561 is a wasteful number, since it uses less digits than its factorization.

66014561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233550.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66014561 is about 8124.9345228131. The cubic root of 66014561 is about 404.1537193193.

The spelling of 66014561 in words is "sixty-six million, fourteen thousand, five hundred sixty-one".