65066621 has 4 divisors (see below), whose sum is σ = 68491200. Its totient is φ = 61642044.

The previous prime is 65066597. The next prime is 65066623. The reversal of 65066621 is 12666056.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65066621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65066623) 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, 1712261 + ... + 1712298.

It is an arithmetic number, because the mean of its divisors is an integer number (17122800).

Almost surely, 2^65066621 is an apocalyptic number.

It is an amenable number.

65066621 is a deficient number, since it is larger than the sum of its proper divisors (3424579).

65066621 is a wasteful number, since it uses less digits than its factorization.

65066621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424578.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 65066621 is about 8066.3883491932. The cubic root of 65066621 is about 402.2098955040.

The spelling of 65066621 in words is "sixty-five million, sixty-six thousand, six hundred twenty-one".