65622421 has 4 divisors (see below), whose sum is σ = 65706592. Its totient is φ = 65538252.

The previous prime is 65622383. The next prime is 65622437. The reversal of 65622421 is 12422656.

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-65622421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65622421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65622451) 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, 40905 + ... + 42478.

It is an arithmetic number, because the mean of its divisors is an integer number (16426648).

Almost surely, 2^65622421 is an apocalyptic number.

It is an amenable number.

65622421 is a deficient number, since it is larger than the sum of its proper divisors (84171).

65622421 is an equidigital number, since it uses as much as digits as its factorization.

65622421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84170.

The product of its digits is 5760, while the sum is 28.

The square root of 65622421 is about 8100.7666921101. The cubic root of 65622421 is about 403.3518775862.

The spelling of 65622421 in words is "sixty-five million, six hundred twenty-two thousand, four hundred twenty-one".