65650621 has 4 divisors (see below), whose sum is σ = 65776672. Its totient is φ = 65524572.

The previous prime is 65650601. The next prime is 65650631. The reversal of 65650621 is 12605656.

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-65650621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65650601) 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, 62241 + ... + 63286.

It is an arithmetic number, because the mean of its divisors is an integer number (16444168).

Almost surely, 2^65650621 is an apocalyptic number.

It is an amenable number.

65650621 is a deficient number, since it is larger than the sum of its proper divisors (126051).

65650621 is a wasteful number, since it uses less digits than its factorization.

65650621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126050.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 65650621 is about 8102.5070811447. The cubic root of 65650621 is about 403.4096469371.

The spelling of 65650621 in words is "sixty-five million, six hundred fifty thousand, six hundred twenty-one".