64422013521 has 4 divisors (see below), whose sum is σ = 85896018032. Its totient is φ = 42948009012.

The previous prime is 64422013457. The next prime is 64422013589. The reversal of 64422013521 is 12531022446.

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 not a de Polignac number, because 64422013521 - 2⁶ = 64422013457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64422013121) 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, 10737002251 + ... + 10737002256.

It is an arithmetic number, because the mean of its divisors is an integer number (21474004508).

Almost surely, 2^64422013521 is an apocalyptic number.

It is an amenable number.

64422013521 is a deficient number, since it is larger than the sum of its proper divisors (21474004511).

64422013521 is a wasteful number, since it uses less digits than its factorization.

64422013521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21474004510.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 64422013521 its reverse (12531022446), we get a palindrome (76953035967).

The spelling of 64422013521 in words is "sixty-four billion, four hundred twenty-two million, thirteen thousand, five hundred twenty-one".